2025-10-06 東京大学
図1 左：カゴメ格子超伝導体CsV3Sb5の結晶構造の模式図。
＜関連情報＞
- https://www.k.u-tokyo.ac.jp/information/category/science/11753.html
- https://www.science.org/doi/10.1126/sciadv.adu2973
カゴメ超伝導体における異常熱ホール効果の観測 Observation of anomalous thermal Hall effect in a Kagome superconductor
Hiroki Yoshida, Hikaru Takeda, Jian Yan, Yui Kanemori, […] , and Minoru Yamashita
Science Advances Published:3 Oct 2025
DOI:https://doi.org/10.1126/sciadv.adu2973
Abstract
Broken time-reversal symmetry (TRS) in superconductors can induce not only spontaneous magnetization by the finite angular momentum of Cooper pairs but also the anomalous thermal Hall effects (ATHEs), whose detection has been extremely challenging. Here, we report the successful observation of an ATHE developing below the superconducting transition temperature at zero magnetic field in the kagome-lattice superconductor CsV3Sb5. This finding is verified by the absence of a signal in a conventional type-II superconductor using the same setup and by ruling out the trapped-vortex effects through micro-Hall array measurements. Both the temperature dependence and the magnitude of the observed anomalous thermal Hall conductivity are quite different from those expected for the quantized thermal edge current of an intrinsic ATHE but consistent with extrinsic impurity-induced ATHEs in chiral superconductivity. Our study of ATHE offers an alternative approach to probe TRS breaking in the superconducting states.
