Abstract

In this study, we examined the relationship between the angular and energy-dependent gap function and the peak-dip-hump structure observed in quasiparticle tunneling spectra within high-temperature superconductor–insulator–normal metal (HTSC-I-N) junctions. We analyzed the tunneling spectra in HTSC-I-N junctions, focusing on the peak-dip-hump structure, using the extended d-wave pairing symmetry and the polaron approach. We investigated two significant aspects of the tunneling spectra observed in experiments, namely, the temperature and doping-dependent evolution of the differential conductance. Furthermore, we estimated the dependence of the pseudogap on hole doping in the cuprate phase diagram by comparing the difference between the binding energies of large polarons and their Coulomb interaction energies. Our calculated results were then compared with experimental data. Importantly, we found a strong quantitative agreement between the theoretical predictions and the experimental observations in the considered cases.

Graphic abstract

中文翻译：

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铜酸盐隧道光谱中峰-倾-驼峰结构的表现：扩展d波配对对称性的研究

摘要

在这项研究中，我们研究了角度和能量相关的间隙函数与在高温超导体-绝缘体-普通金属（HTSC-IN）结内的准粒子隧道光谱中观察到的峰-谷-驼峰结构之间的关系。我们使用扩展的d波配对对称性和极化子方法分析了 HTSC-IN 结中的隧道光谱，重点关注峰-谷-驼峰结构。我们研究了实验中观察到的隧道光谱的两个重要方面，即微分电导的温度和掺杂依赖性演化。此外，我们通过比较大极化子的结合能与其库仑相互作用能之间的差异，估计了铜酸盐相图中赝能隙对空穴掺杂的依赖性。然后将我们的计算结果与实验数据进行比较。重要的是，我们发现在所考虑的情况下理论预测与实验观察之间存在很强的定量一致性。

图文摘要