A quasi-two-dimensional electron system resulting from a layered crystal structure is a common feature of high-temperature superconductors. In such a system, an interlayer Josephson coupling is responsible for bulk superconductivity. However, materials of interest are limited for Bi-based cuprates which have underdamped and systematically controllable interlayer Josephson junctions. Here, we report the c-axis transport properties and an interlayer Josephson coupling of a 1212-type cuprate superconductor which have not been well studied so far. We demonstrate an underdamped Josephson coupling between superconducting CuO2 double-layers through a chemically controllable (Pb,Cu)–O barrier layer. Broadly tunable Josephson properties through a chemical substitution demonstrated in this work in conjunction with a rich variety of barrier layers for 1212-type cuprates can potentially offer a material breakthrough in the research field of intrinsic Josephson junctions.
後藤准教授が筆頭著者の真空電子デバイスに関する論文がIEEEの雑誌、IEEE Transactions on Electron Devicesに掲載されました。
Y. Gotoh et al., “Development of a Field Emission Image Sensor
Tolerant to Gamma-Ray Irradiation”,
IEEE Transactions on Electron Devices Volume 67, Issue 4,
pp. 1660-1665 (2020). https://doi.org/10.1109/TED.2020.2977674
京都大学の超伝導・真空電子デバイスに関する研究室, Research group for superconducting and vaccum electronics in Kyoto Univ.