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Electrically controlled crossed Andreev reflection in altermagnet/superconductor/altermagnet junctions Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-24 Zhi Ping Niu and Yong Mei Zhang
Altermagnets are a novel class of magnetic materials with a significant non-relativistic spin splitting band structure but zero net macroscopic magnetization. We here investigate the interplay between altermagnetism and superconductivity and how the band structures of the altermagnet affect nonlocal transport across altermagnet/superconductor/altermagnet junctions. The two types of spin-momentum coupling:
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Investigation of quasi-particle relaxation in strongly disordered superconductor resonators Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-24 Jie Hu, Jean-Marc Matin, Paul Nicaise, Faouzi Boussaha, Christine Chaumont, Michel Piat, Viet Dung Pham and Piercarlo Bonifacio
In this paper, we investigate the quasi-particle (QP) relaxation of strongly disordered superconducting resonators under optical illumination at different bath temperatures with the Rothwarf and Taylor equations and the gap-broadening theory described by the Usadal equation. The analysis is validated with various single-photon responses of titanium nitride (TiN) microwave kinetic inductance detectors
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Experimental AC loss study on REBCO coil assemblies coupled with an iron cylinder Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-24 Yue Wu, Jin Fang, Daisuke Miyagi, Naoyuki Amemiya, Rodney A Badcock, Nicholas J Long and Zhenan Jiang
In high-temperature superconducting (HTS) power devices, the presence of iron cores changes the magnetic field profile around the HTS coil windings, potentially affecting their AC loss characteristics. AC loss measurements for HTS coil windings coupled with an iron core using the electrical method can lead to a significant error, owing to the indirect estimation of the iron core loss through using
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Vortex-glass transition and vortex pinning behavior in three-dimensional NbTiN epitaxial films Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-24 Zi-Yan Han, Tian-Yu Jing, Jian Yang, Wen-Bo Cai and Zhi-Qing Li
In the present paper, the vortex dynamics in two NbTiN epitaxial films have been explored via analyzing the current–voltage (I–V) curves measured at different temperatures and fields. The thicknesses of the two films are ∼50 and ∼100 nm, respectively, and they are three-dimensional (3D) with respect to superconductivity. The films transform from normal state to superconducting state with decreasing
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Numerical study on the transport current distribution in the multi-layer CORC coil Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-24 Chao Li, Wenchao Yang, Quan Li, Bin Li, Ying Xin and Jiabin Yang
The conductor on round core (CORC) cable has attracted increasing attention due to its strong and high-efficient current carrying capacity. It is considered as one of ideal candidate cables for manufacturing nuclear fusion magncets. Under the circumstance, the transport current distribution of the coils wound by CORC cables has significant impacts on the operating performance of nuclear fusion magnets
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Influence of HTS tape arrangement on the transverse compression performance of copper former CORC cables Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-22 Yangyang Shi, Tao Ma, Shaotao Dai, Wenxu Liu, Huan Jin and Jinggang Qin
CORC cables are subject to large transverse compression electromagnetic forces in fusion projects. Unfortunately, the electromagnetic force exceeding its critical transverse compression load will cause an irreversible decrease in its critical current. Therefore, it is particularly important to enhance the critical transverse compression load to ensure that the critical current does not decrease during
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Vortex in superconducting thin-film strips of arbitrary width Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-17 Norio Nakagawa and Vladimir G Kogan
The currents and field distributions of a vortex in a thin superconducting strip of a width W are considered. It is shown that unlike infinite films where the vortex field crosses the film only in one direction (say, from the half-space under the film to the half-space above it), in strips (as well as in finite size film samples of any shape) the field lines go back to the lower half-space not only
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Unlocking the performance evolution of GdBCO coated conductors irradiated by deuterium plasma Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-17 Meiqi Wang, Daxing Huang, Tongxin Wang, Hao Dong, Wenjie Zhang, Zhenyu Jiang, Hongwei Gu, Kaigui Zhu and Fazhu Ding
REBa2Cu3O7-δ (REBCO, RE: rare earth) coated conductors (CCs) can generate a powerful magnetic field and are optimal for sustaining the reaction in fusion devices. However, the REBCO CCs will inevitably be exposed to neutron radiation during device operation. Transmutation produces gas atoms such as hydrogen will affect their properties. In this paper, GdBCO CCs were irradiated by 20 eV deuterium plasma
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Unveiling the growth mechanism of FeSeTe films by pulsed laser deposition technique Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-17 Jia-Ying Zhang, Ya-Xun He, Tian He, Jing-Yu He, Wei-Bin Wu and Jun-Yi Ge
The superconductivity of FeSeTe films, deposited by the pulsed laser deposition (PLD), is extremely sensitive to the preparation conditions. Hence, it is necessary to study the growth mechanism and reveal the key factors affecting the superconductivity of FeSeTe films. Among all the preparation conditions, the substrate temperature ( ) is one of the most critical one because it can alter the diffusion
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Improving photon number resolvability of a superconducting nanowire single-photon detector array using a level comparator circuit Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-17 Jia Huang, Xingyu Zhang, Weijun Zhang, Yong Wang, Chaolin Lv, Guangzhao Xu, Xiaoyu Liu, Hao Li, Zhen Wang, Lixing You
Photon number resolving (PNR) capability is very important in many optical applications, including quantum information processing, fluorescence detection, and few-photon-level ranging and imaging. Superconducting nanowire single-photon detectors (SNSPDs) with a multipixel interleaved architecture give the array an excellent spatial PNR capability. However, the signal-to-noise ratio (SNR) of the PNR
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NbN-based tunnel-type π-junctions for low-power half-flux-quantum circuits Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-17 Duong Pham, Feng Li, Kenjiro Oba, Yuto Takeshita, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki
We have developed half-flux-quantum (HFQ) circuits using all-π-junctions formed from an NbN/AlN/PdNi/NbN (SIFS) structure. The circuits were fabricated using a novel process that incorporated a ground plane on top of the chip, enabling the epitaxial growth of NbN-based junctions from the substrate. The π-state of the junctions was demonstrated through a HFQ shift. Notably, these π-junctions exhibited
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Development of persistent joints for superconducting Bi-2212 coils Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-08 Petr Zagura, Ingon Kim, Frederick Follows, Clara Barker, Ziad Melhem, Andrew Twin, Steven Ball, Chris Grovenor, Susannah Speller, Tayebeh Mousavi
Bi2Sr2CaCu2O8+x (Bi-2212) multifilamentary wire is the only high-temperature superconductor manufactured in the form of an isotropic round wire, and so offers a number of advantages for the designers of high field magnets. However, for high-field (>25 T), high-stability magnet applications, ultra-low resistance superconducting joints (R < 10−12 Ω) will be needed to take advantage of the excellent properties
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On the criteria for superconducting superlattices using CaCuO2 * Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-03 Ai Ikeda, Yoshiharu Krockenberger, Yoshitaka Taniyasu, Hideki Yamamoto
The manifestation of superconductivity in cuprate superconductors is concerted to copper-oxygen planes. To maintain charge neutrality, the copper-oxygen planes are embedded between materials, that are electronically insulating. Here, we introduce BaBiO3, LaCrO3, EuFeO3, and Ca2Fe2O5 as candidate materials. We use molecular beam epitaxy as a synthesis tool for the development of artificial superconducting
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Progress in superconducting REBa2Cu3O7 (RE = rare earth) coated conductors derived from fluorinated solutions Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-02 X Obradors, T Puig, S Ricart, A Palau, M Coll, J Gutiérrez, J Farjas, E Bartolomé
In this work, we review recent progress achieved in the use of chemical solution deposition (CSD) based on fluorinated metalorganic precursors to grow superconducting REBa2Cu3O7 (REBCO) films and coated conductors (CCs). We examine, first of all, the advances in optimizing the steps related to the solutions preparation, deposition and pyrolysis based on novel low-fluorine metalorganic solutions. We
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Performance degradation due to thermal cycling in soldered Faraday and SuperPower HTS tape stacks Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-04-02 Theodore Mouratidis, Dennis G Whyte
Soldering stacks of high temperature superconducting (HTS) tapes results in a current carrying matrix with high electrical, thermal, and mechanical stability. In some applications, these tape stacks may be exposed to elevated temperatures during thermal heat cycles. Previous research on thermal degradation of high temperature superconductors has been performed with isolated crystals or individual HTS
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High area efficiency binary neural processing elements with time-domain signals using SFQ circuits Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-14 Zeyu Han, Zongyuan Li, Nobuyuki Yoshikawa, Yuki Yamanashi
With the increasing processor performance requirements of convolutional neural networks, we believe that research on superconducting neural networks based on single flux quantum (SFQ) circuits holds significant potential. However, the typical multiply and accumulate operations used in neural networks often lead to a significant increase in circuit area due to the limitations of the integration density
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Study of the demagnetization behavior of no-insulation persistent-current mode HTS coils under external AC fields by 3D FEM simulation Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-13 Zhuoyan Zhong, Wei Wu, Guangtong Ma, Zhijian Jin
The no-insulation (NI) winding technique is promising for applications in the persistent-current mode (PCM) operation of high-temperature superconducting (HTS) coils. To produce an NI PCM coil, it is essential to understand its demagnetization behavior (i.e. decay of persistent DC current) under an external AC field, which occurs in maglev trains, electric machines and other dynamic magnet systems
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Improving the recovery performance of superconducting fault current limiters using nitrogen/tetrafluoromethane mixed coolants Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-13 Zhihao Zhou, Qingquan Qiu, Liwei Jing, Naihao Song, Yuping Teng, Jingye Zhang, Liye Xiao
The superconducting fault current limiter (SFCL) improves the power grid safety by restricting the drastically increased current when the circuit fault occurs. However, the SFCL suffers from a long recovery time and can hardly recover to the superconducting state before the breaker attempts to reclose, which hinders its practical application. This paper presents the implementation of the rapid-recovery
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Gamma radiation effects on high-temperature superconducting ReBCO tape Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-13 Ying Zheng, Jinxing Zheng, Xudong Wang, Yudong Lu
High-temperature superconducting (HTS) magnets are crucial components in future fusion reactors, subjected to prolonged irradiation and complex mechanical conditions. While the irradiation sensitivity of HTS materials has been extensively studied, limited research has explored the effects of force conditions during irradiation. This study investigated the influence of irradiation on ReBCO tapes. An
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Revealing the effect of bridges in the multi-filamentary Bi-2212 wires Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-13 Zhen-Chuang Zhang, Min Yu, Dong-Sheng Yang, Meng-Liang Zhou, Hai-Shan Zhou, Jing-Gang Qin
As the excellent current carrying capacity in ultra-high magnetic fields, Bi-2212(Bi2Sr2CaCu2O8+x ) has attracted much attention. In view of the unique nature of Bi-2212, high-temperature heat treatment is highly needed for the formation of the continuous textured structure in the multi-filamentary Bi-2212 wire. In the meanwhile, bridges between filaments can also be produced in the heat treatment
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A superconducting switch using induced current in the closed loop circuit Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-08 Gengyao Li, Chao Li, Ying Xin, Bin Li
Superconducting magnets have been applied in many fields because of the high magnetic field and the low loss. In order to energize superconducting magnets and operate them in the persistent current mode, the superconducting switch is essential. Recently, a superconducting switch using the interaction between the DC transport current and induced current in a closed loop circuit has been proposed, which
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A new ductile, tougher resin for impregnation of superconducting magnets Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-07 Emanuela Barzi, Daniele Turrioni, Ibrahim Kesgin, Masaki Takeuchi, Wang Xudong, Tatsushi Nakamoto, Akihiro Kikuchi
A major remaining challenge for Nb3Sn high field magnets is their training due to random temperature variations in the coils. The main objective of our research is to reduce or eliminate it by finding novel impregnation materials in replacement of the epoxies currently used. An organic olefin-based thermosetting dicyclopentadiene resin, C10H12, commercially available in Japan as TELENE® by RIMTEC,
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Memristive effects in YBa2Cu3O7-x devices with transistor-like structure Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-04 Aurélien Lagarrigue, Carolina de Dios, Santiago J Carreira, Vincent Humbert, Salvatore Mesoraca, Javier Briatico, Juan Trastoy, Javier E Villegas
Cuprate superconductors are highly sensitive to disorder and oxygen stoichiometry; even minute variations of those parameters drastically change their electronic properties. In this work, we exploit this characteristic to engineer a memristive device based on the high-TC superconductor YBa2Cu3O7−x (YBCO), in which local changes of the oxygen content and induced disorder are harnessed to produce memory
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Training-free performance of the wax-impregnated SuShi septum magnet Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-01 D Barna, K Brunner, M Novák, J Borburgh, M Atanasov, F Lackner, M Olvegård, K Pepitone, R Santiago Kern, C Svanberg, T Bagni
In the framework of the Future Circular Collider Study a new septum magnet concept, nicknamed ‘SuShi’ has been developed, and a prototype was built at Wigner Research Center for Physics, and tested at the FREIA facility of Uppsala University in April 2023. The concept uses a canted cosine theta (CCT)-like superconducting magnet and a passive superconducting shield to create a zero-field and high-field
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Enhancing levitation force of superconductors through wavelength optimization in Halbach permanent magnet arrays Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-03-01 Xiaoning Liu, Mayin Si, Zhihao Ke, Zigang Deng
Optimizing the wavelength (γ) of the Halbach array permanent magnet guideway (PMG) in superconducting maglev systems can improve levitation performance without consuming additional materials. The value of γ impacts the external field intensity He and gradient ∇He generated by the PMG. The total amount of magnetic field energy is fixed, and the γ essentially regulates the distribution of this energy
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Flux transfer circuits breaking conventional limit in transfer coefficient based on a negative inductance of a π-junction Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-29 Masayuki Higashi, Feng Li, Masamitsu Tanaka, Akira Fujimaki
We have demonstrated transfer coefficients breaking the conventional limit in flux transfer circuits (FTCs) by introducing a π-phase-shifted Josephson junction (π-junction), where the FTCs include an input/output inductor. According to the current-phase relationship of a π-junction, the π-junction behaves as an inductor with intrinsically negative kinetic inductance. When a single-π-junction superconducting
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Replication and study of anomalies in LK-99—the alleged ambient-pressure, room-temperature superconductor Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-29 T Habamahoro, T Bontke, M Chirom, Z Wu, J M Bao, L Z Deng, C W Chu
We have studied LK-99 [Pb10−x Cu x (PO4)6O], alleged by Lee et al to exhibit superconductivity above room temperature and at ambient pressure, and have reproduced all anomalies in electric and magnetic measurements that they reported as evidence for the claim of LK-99 being an ambient-pressure, room-temperature superconductor. We found that these anomalies are associated with the structural transition
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Evolution of phase slips with wire width and observation of critical-voltage feature without high-impedance environment in NbN nanowires Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-23 Xiaoni Wang, Zulei Xu, Xiaoyu Liu, Fei Xu, Yixin Liu, Wanpeng Gao, Yu Wu, Ming Yang, Wei Peng, Zhen Wang, Gang Mu, Zhi-Rong Lin, Xiaoming Xie
Quantum phase slip (QPS) is an important effect that occurs in one-dimensional (1D) or quasi-1D superconducting (SC) materials. Due to the extremely high requirements on the uniformity and quality of SC nanowires, it is currently very challenging to obtain repeatable and controllable QPS devices. Here, we report a systematic study of the QPS effect in NbN SC nanowires. High-quality NbN nanowires with
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Impact of local plastic deformation on thermo-magnetic instability of high-J c Nb3Sn strand Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-23 Yunhao Liu, Yu Wu, Arend Nijhuis, Zichuan Guo, Yi Shi, Fang Liu, Lina Zhu, Chao Dai, Iksang Shin, Kihong Sim, Jinggang Qin
The future fusion reactor devices built by Institute of Plasma Physics, Chinese Academy of Science will be a compact burning plasma facility to fill the gap between ITER and the China Fusion Engineering Test Reactor, with the mission of studying the deuterium–tritium plasma in steady-state operation. The winding-package (WP) of its toroidal field coil is graded into high-field WP and low-field WP,
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Fabrication and properties of lateral Josephson junctions with a RuO2 weak link Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-22 Kumar Prateek, Thomas Mechielsen, Aymen Ben Hamida, Douwe Scholma, Yao Junxiang, Jan Aarts
Ruthenium dioxide (RuO2) is a metallic rutile oxide with a number of interesting properties. For a long time, it was considered to be a highly conductive normal metal and a Pauli paramagnet. Recently, it was found that the material is antiferromagnetic, with small magnetic moments of the order of 0.05 Bohr magneton and an ordering temperature above 300 K. The presence of magnetic moments should have
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In-depth S/TEM observation of Ti–Hf and Ta–Hf-doped Nb3Sn layers Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-22 Nobuya Banno, Taku Moronaga, Toru Hara, Koki Asai, Tsuyoshi Yagai
In superconducting Nb3Sn layers with coherence lengths of approximately 3 nm, grain boundaries act as effective pinning sites. Thus, grain refinement is an essential issue that directly affects the superconducting critical characteristics of the Nb3Sn layer. In recent years, Hf addition to Nb3Sn wires co-doped with Ta has attracted notable interest as a method that enables grain refinement down to
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Superconducting properties of bismuthate/manganite epitaxial multilayers Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-21 Sachio Komori, Tomoyasu Taniyama
We report epitaxial growth and superconducting properties of superconductor/ferromagnet (S/F) multilayers consisting of an s-wave superconducting bismuthate BaPb0.75Bi0.25O3 (BPBO) and a ferromagnetic insulating manganite La0.875Sr0.125MnO3 (LSMO). We demonstrate that the superconductivity of BPBO sandwiched by LSMO is preserved down to a thickness close to the superconducting coherence length. The
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Superconducting nitridized-aluminum thin films Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-14 Alba Torras-Coloma, Leyre Martínez de Olcoz, Eva Céspedes, Elia Bertoldo, David López-Núñez, Sagar Paul, Wolfgang Wernsdorfer, Gemma Rius, P Forn-Díaz
We report the direct observation of superconductivity in nitridized-aluminum thin films. The films are produced by sputtering deposition of aluminum in a controlled mixture of nitrogen diluted in argon. The concentration of applied nitrogen directly determines the properties of the superconducting thin films. We observe samples displaying critical temperatures up to 3.38 ± 0.01 K and resilience to
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High critical current density in low-cost iron-based superconducting round wires annealed at ambient pressure Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-13 Caida Fu, Chiheng Dong, Chang Tu, Meng Han, He Huang, Dongliang Wang, Xianping Zhang, Yanwei Ma
Superconducting round wires with isotropic architecture are preferred in fabrications of cables and magnets. To diminish the obstacles to supercurrent, e.g., voids, cracks and bubbles, over-pressure heat treatment or hot isostatic pressing is indispensable in the final annealing process. Here, we fabricated a stainless steel/Cu/Ag sheathed Ba0.6K0.4Fe2As2 superconducting round wire without the aid
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A proof-of-concept Bitter-like HTS electromagnet fabricated from a silver-infiltrated (RE)BCO ceramic bulk Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-13 R W Taylor, H W Weijers, M D Ainslie, J V J Congreve, J H Durrell, R A Badcock, C W Bumby
A novel concept for a compact high-field magnet coil is introduced. This is based on stacking slit annular discs cut from bulk rare-earth barium cuprate ((RE)BCO) ceramic in a Bitter-like architecture. Finite-element modelling shows that a small 20 turn stack (with a total coil volume of < 20 cm3) is capable of generating a central bore magnetic field of > 2 T at 77 K and > 20 T at 30 K. Unlike resistive
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Fast and accurate electromagnetic modeling of non-insulated and metal-insulated REBCO magnets Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-13 Enric Pardo, Philippe Fazilleau
REBCO high-temperature superconductors are promising for all-superconducting high-field magnets, including ultra-high field magnets. Non-insulated (NI) and metal-insulated (MI) windings are a good solution for protection against electro-thermal quench. Design and optimization requires numerical modelling of REBCO inserts for high-field magnets. Here, we detail a fast and accurate two-dimensional cross-sectional
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Numerical study on the electromagnetic characteristics of multi-layer CORC cables Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-13 Chao Li, Wenchao Yang, Bin Li, Ying Xin, Jiabin Yang
Due to the high isotropy and low AC losses, the multi-layer conductor on round core (CORC) cable is a good candidate for high field magnets, such as central solenoid magnets in fusion. Considering the difficulty in experimental measurement, numerical model is an effective way to illustrate the electromagnetic characteristics of the multi-layer CORC cable and provide further insights into its working
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Low-loss millimeter-wave resonators with an improved coupling structure Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-08 A Anferov, S P Harvey, F Wan, K H Lee, J Simon, D I Schuster
Millimeter-wave superconducting resonators are a useful tool for studying quantum device coherence in a new frequency domain. However, improving resonators is difficult without a robust and reliable method for coupling millimeter-wave signals to 2D structures. We develop and characterize a tapered transition structure coupling a rectangular waveguide to a planar slotline waveguide with better than
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Thermal runaway criterion as a basis for the protection of high-temperature superconductor magnets Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-07 M Marchevsky, S Prestemon
High-temperature superconductor (HTS) based high-field magnet systems are essential for particle accelerators and fusion energy applications. Quench protection of such magnets is difficult owing to a slow quench propagation velocity in HTS. While in conventional NbTi and Nb3Sn-based magnets, a normal zone expands typically quickly, and the stored energy is dissipated across a large volume of the windings
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Monolithic integration of superconducting-nanowire single-photon detectors with Josephson junctions for scalable single-photon sensing Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-06 Saeed Khan, Bryce A Primavera, Richard P Mirin, Sae Woo Nam, Jeffrey M Shainline
We demonstrate superconducting single-photon detectors (SPDs) that integrate signals locally at each pixel. This capability is realized by the monolithic integration of superconducting-nanowire SPDs with Josephson electronics. The motivation is to realize superconducting sensor elements with integrating capabilities similar to their CMOS-sensor counterparts. The pixels can operate in several modes
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Review of materials for HTS magnet impregnation Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-05 Joshua Feldman, Wolfgang Stautner, Christopher Kovacs, Nenad Miljkovic, Kiruba S Haran
Construction of high-temperature superconducting magnets typically involves impregnation of a coil in a liquid medium, such as epoxy, which is then solidified. This impregnation provides mechanical integrity to the magnet and facilitates heat transfer. The choice of material used for impregnation requires careful consideration of the material properties and the performance requirements in order to
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Optimisation of the processing parameters for the fabrication of high-quality joints between Y–Ba–Cu–O single grain, bulk superconductors Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-05 J V J Congreve, Y Shi, H Druiff, A R Dennis, R W Taylor, C W Bumby, D A Cardwell, J H Durrell
High-strength permanent magnets are essential for a wide range of technologies, including levitation devices, motors, generators and magnetic separators. Replacing permanent magnets with single grain, bulk superconductors will enable a step-change in the performance of these technologies by providing an order-of-magnitude increase in magnetic field. However, there remain many key challenges to the
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A 6-around-1 cable using high-temperature superconducting STAR ® wires for magnet applications Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-02 Nathaly Castaneda, Paolo Ferracin, Cyrus Funkhouser, Eduard Galstyan, Hugh C Higley, Sri Ram Korupolu, Goran Majkic, Hoang Nguyen, Soren O Prestemon, Venkat Selvamanickam, Huy Truong, Xiaorong Wang
To generate a dipole field above 20 T, we need high-temperature superconductors, including REBa2Cu3O 7−x (RE = rare earth, rebco) coated conductors. However, the optimal architecture of a high-current flexible rebco cable is not yet settled for high-field magnet applications. Here we report a 6-around-1 cable concept based on the high-temperature superconducting star ® wires. We made two cable samples
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Enhancement of superconductivity by organic flexible substrates in NbSe2 thin flakes Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-02 Da Jiang, Bingxin Chen, Yixin Liu, Wei Peng, Wei Li, Zhenghua An, Gang Mu
The regulation of superconductivity is of great significance in basic physics and device applications. Typically superconductivity can be tuned by chemical doping, gate voltage, and pressure. The interaction between superconductivity and substrates in low-dimensional systems is concerned in recent years, but a systematic and in-depth investigation is still lacking. Here we report a systematic study
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Influence of thickness and domain structure on the vortex instability of superconducting/ferromagnetic bilayers Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-02 G Blatter, M Sirena, Yeonkyu Lee, Jinyoung Yun, Jeehoon Kim, E De Biasi, N Haberkorn
We report on the vortex instability in superconducting/ferromagnetic (FM) bilayers. Samples consisting of a 23 nm thick Mo2N superconducting layer with a capping layer of Co, Fe20Ni80, or FePt ferromagnets were grown by sputtering at room temperature on silicon (100). Our study reveals that the critical vortex velocity in these superconducting bilayers is significantly influenced by the thickness of
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Operation of kinetic-inductance travelling wave parametric amplifiers at millimetre wavelengths Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-01 B-K Tan, N Klimovich, R Stephenson, F Faramarzi, P Day
It is expected that the operation of microwave kinetic inductance travelling wave parametric amplifiers (KITWPAs) can be extended to the millimetre (mm) and the sub-mm wavelength range as long as the frequency is below the gap frequency of the superconducting film. This paper presents possible mm-wave designs for KITWPAs based on microstrip transmission lines. Our device is designed based on the BCS
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Superconductivity of amorphous and crystalline Re–Lu films Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-30 Serafim Teknowijoyo, Armen Gulian
We report on superconducting properties of a novel material: rhenium-lutetium films. Different compositions of Re x Lu binary are explored from x ≈ 3.8 to close to pure Re stoichiometry. The highest critical temperature, up to Tc≈ 7 K, is obtained for x ≈ 10.5 in accordance with electron dispersive spectroscopy results. Depending on the deposition conditions, polycrystalline or amorphous films are
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Resistance at 77 K of two Bi-2223 coils with superconducting joints prepared by incongruent melting Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-29 Shintetsu Kanazawa, Chihiro Sekine
A superconducting joint for multi-filamentary Bi2Sr2Ca2Cu3O10+δ (Bi2223) tape, which has applications in nuclear magnetic resonance and magnetic resonance imaging, has been developed based on incongruent melting and multi-junction methods. In this study, the critical current limit, optimal oxygen annealing conditions, and reproducibility of this joint are experimentally evaluated. The results indicate
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Alternative analytical models for HTS tapes considering their AC hysteretic and resistive losses Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-29 João F P Fernandes, Luís F D Bucho, F Ferreira da Silva, Inês S P Peixoto, Silvio Vaschetto, P J Costa Branco
This work proposes two alternative analytical models to evaluate the ac losses of high-temperature superconducting (HTS) tapes during their hysteretic and resistive modes. These models intend to extend the application range of state-of-the-art analytical models for current values higher than the critical one, i.e. for the resistive state, and to correctly predict the ac losses during the transition
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Enhanced performance of GdBCO bulk superconductors by doping a new kind of YGdBa4CuNbO y nanoparticles Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-25 YanLan Cui, WanMin Yang
In this work, a new kind of YGdBa4CuNbO y (YGdNb-11411) nano-particles was designed and sintered using a solid-state reaction method, whereas their impact on the performance of GdBCO bulks was investigated for the first time. From the acquired x-ray diffraction data and scanning electron microscopy imaging results, it was proved that the YGdNb-11411 particles were of excellent chemical stability and
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Low-frequency electron–phonon interaction and superconductivity in L12 -type trialuminides Al3V Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-25 Feihu Liu, Junling Che, Wei Fu, Li-Na Wu
Superconductivity enhancement is often associated with phonon softening by doping or external pressure. In this paper, we report L12 -type trialuminides Al3V as a typical example belonging to this scenario. The electronic, phononic and superconducting properties have been studied by using the first-principle method. Under uniaxial compression, the superconducting transition temperature Tc of Al3V can
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Effect of transverse compressive stress applied at room temperature on Nb3Sn Rutherford cables Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-24 Gilles Lenoir, Kirtana Puthran, Christian Barth, Jérôme Fleiter, Amalia Ballarino
The accelerator magnets for the high luminosity upgrade of the large Hadron collider use Nb3Sn conductor to achieve the required in-field performance. To sustain the Lorentz forces during operation, a pre-compression is applied to the coils during the fabrication of the magnet. This can lead to an irreversible degradation of the Nb3Sn conductor due to its mechanical sensitivity. In this study, the
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Thermal-vibration correlation study for high-temperature superconducting maglev intelligent monitoring based on back propagation neural network analysis Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-22 Peng Pang, Jun Zheng, Yonghai Zhao, Le Xu, Chenling Xian
The internal temperature rise inside the high-temperature superconducting (HTS) superconductor (SC) resulting from irregular magnetic field (MF) above the permanent magnet guideway is a major factor contributing to the decline of levitation performance. Real-time monitoring of the temperature rise inside YBCO SC is an important issue for the safe operation of the maglev train systems. However, the
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Conceptual design and simulation of a thermal matrix-type SFCL Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-22 Zhixing Gui, Yu Wang, Jiming Lu, Zhongming Yan
Simultaneous quench is a prerequisite for achieving high-rated voltage and current in superconducting fault current limiters (SFCLs) based on superconducting thin films. In this article, we propose the T-MSFCLs, i.e. the matrix-type SFCLs (MSFCLs) with thermally-assisted simultaneous quenches, to mitigate hotspot and dielectric breakdown problems. We present the typology of the non-isolated and isolated
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On the coupling of magnetic moments to superconducting quantum interference devices Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-19 J Linek, M Wyszynski, B Müller, D Korinski, M V Milošević, R Kleiner, D Koelle
We investigate the coupling factor φ µ that quantifies the magnetic flux Φ per magnetic moment µ of a point-like magnetic dipole that couples to a superconducting quantum interference device (SQUID). Representing the dipole by a tiny current-carrying (Amperian) loop, the reciprocity of mutual inductances of SQUID and Amperian loop provides an elegant way of calculating ϕμ(r,eˆμ) vs. position r and
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Improving Nb3Sn cavity performance using centrifugal barrel polishing Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-16 Eric Viklund, David N Seidman, David Burk, Sam Posen
In this study we will show a new method of polishing for Nb3Sn cavities known as centrifugal barrel polishing (CBP). Using this method, Nb3Sn coated samples are polished to a surface roughness comparable to a traditional Nb cavity after electropolishing. We also investigate different methods of cleaning the Nb3Sn surface after CBP to remove residual abrasive particles. The polished Nb3Sn surface is
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An experimental study to investigate magnetic field and winding force-dependent contact resistance of NI REBCO coil Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-12 Jeseok Bang, Griffin Bradford, Jonathan Lee, Dmytro Abraimov
This paper reports the magnetic field and winding force-dependent contact resistance, also known as characteristic resistance, of no-insulation (NI) REBCO coil. Three NI coils were wound with different winding forces ( < 1 kgf, 3 kgf, and 5 kgf) using the same REBCO-coated conductor, and they were tested at 4.2 K in a background field of 0, 5, 10, and 14 T. The contact resistance of each coil is measured
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A quench detection method for parallel co-wound HTS coils based on current redistribution Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-12 Changhao Hu, Yi Lin, Yunfei Tan, Lei Wang, Jianzhao Geng
High-temperature superconducting (HTS) coated conductors (CCs) have become the preferred material for superconducting magnet applications due to their high engineering current density and high mechanical strength. However, due to the low quench zone propagation velocity of CCs, magnets wound with CCs suffer from severe quench risks. Therefore, a rapid, sensitive, and reliable quench detection method
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Very strong levitation force and stability achieved with a large MgB2 superconductor disc Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-11 Yiteng Xing, Giacomo Russo, Pier Luigi Ribani, Antonio Morandi, Pierre Bernstein, Julie Rossit, Sebastien Lemonnier, Fabian Delorme, Jacques Noudem
This rapid communication highlights a remarkable achievement obtained with a 120 mm diameter large cylindrical MgB2 bulk: the measurement of magnetic levitation forces up to 700 N at 20 K, levitation being stable up to levitation forces exceeding 400 N. The investigated sample, which has one of the largest dimensions reported in the literature, was fabricated using the unconventional spark plasma sintering
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Correlation of strontium anharmonicity with charge-lattice dynamics of the apical oxygens and their coupling to cuprate superconductivity Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-08 Steven D Conradson, Victor Velasco, Marcello B Silva Neto, Chang-Qing Jin, Wen-Min Li, Li-Peng Cao, Andrea Gauzzi, Maarit Karppinen, Andrea Perali, Sandro Wimberger, Alan R Bishop, Gianguido Baldinozzi, Matthew Latimer, Edmondo Gilioli
By means of Cu K edge x-ray absorption spectra of overdoped high-pressure oxygenated superconducting YSr2Cu2.75Mo0.25O7.54 and Sr2CuO3.3 , we demonstrate a remarkably strong three way correlation between the superconductivity and the local dynamics of their highly anharmonic Cu–Sr and Cu-apical O pairs. We model the latter as aspects of the Internal Quantum Tunneling Polarons (IQTPs) that give the