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 clear consequences when trying to induce superconductivity in RuO₂. We used a selective area chemical vapor deposition method to grow nanostrips of RuO₂ on TiO₂ substrates. On these nanostrips, superconducting contacts were made of MoGe, and a weak link was fabricated with a Focused Ion Beam. We find that the device behaves as a Josephson junction, including a Fraunhofer-like response to a magnetic field, for distances between the contacts below 70 nm. We estimate the induced singlet coherence length ξ to be about 12 nm, which seems a reasonable number when small magnetic moments are present.

中文翻译：

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具有 RuO2 弱连接的横向约瑟夫森结的制造和性能

二氧化钌 (RuO ₂ ) 是一种金属金红石氧化物，具有许多有趣的特性。长期以来，它被认为是一种高导电率的普通金属和泡利顺磁体。最近，人们发现该材料是反铁磁性的，具有 0.05 Bohr 磁子量级的小磁矩和高于 300 K 的有序温度。当试图在 RuO 2 中诱导超导性时，磁矩的存在应该会产生明显的_后果。我们使用选择性区域化学气相沉积方法在TiO ₂基底上生长RuO ₂纳米带。在这些纳米带上，超导触点由 MoGe 制成，并用聚焦离子束制造薄弱连接。我们发现，当接触点之间的距离低于 70 nm 时，该器件表现为约瑟夫森结，包括对磁场的类似夫琅和费的响应。我们估计诱导单重态相干长度Ψ约为 12 nm，当存在小磁矩时，这似乎是一个合理的数字。