講演情報
[17p-K102-12]Detailed investigation of field-free superconducting diode effect in layered superconductor FeSe
〇(M1)Utane Nagata1, Akito Daido3,2, Ryo Ohshima1,2, Youichi Ynanase2,3, Masashi Shiraishi1,2 (1.Dept. of Engineering, Kyoto Univ., 2.CSRN Kyoto Univ., 3.Dept. of Science, Kyoto Univ.)
キーワード：
Superconducting diode effect、Iron-based superconductor、Layered material
Superconducting diode effect (SDE) is a phenomenon, where nonreciprocal supercurrent flow takes place, has been intensively investigated from both experimental and theoretical approaches in spintronics as a novel physical effect. Recently, we observed SDE without magnetic field in layered superconductor FeSe, of which origin is elucidated to be the interplay of thermal gradient originated from the Joule heating at contact resistances between FeSe and electrodes and an asymmetric geometry of FeSe. In this study, we conducted detailed investigations to support the underlying physics we claimed. We experimentally investigated the influence of the geometry/edge effects and the relationship between the polarity of the SDE and the thermal gradient in the device. And we got the direct proof which indicates that the origin of this effect is the thermal gradient in the FeSe device, and more importantly, the SDE we discovered is the intrinsic effect.