Observation of anomalous thermal Hall effect in a Kagome superconductor
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 CsV<sub>3</sub>Sb<sub>5</sub>. 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.
Authors
- Stephen D. Wilson (ORCID: https://orcid.org/0000-0003-3733-930X)
- M. Kończykowski (ORCID: https://orcid.org/0000-0003-3376-5635)
- T. Shibauchi (ORCID: https://orcid.org/0000-0001-5831-4924)
- Yuzki M. Oey (ORCID: https://orcid.org/0000-0003-1131-9829)
- Hikaru Takeda (ORCID: https://orcid.org/0000-0002-0726-0601)
- K. Ishihara (ORCID: https://orcid.org/0000-0002-8835-342X)
- Jian Yan (ORCID: https://orcid.org/0000-0001-5730-8821)
- Minoru Yamashita (ORCID: https://orcid.org/0000-0002-3616-6606)
- Brenden R. Ortiz (ORCID: https://orcid.org/0000-0002-1333-7003)
- Yui Kanemori
- Hiroki Yoshida
Institutions
- Oak Ridge National Laboratory (US)
- Centre National de la Recherche Scientifique (FR)
- École Polytechnique (FR)
- University of California, Santa Barbara (US)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Chengdu University (CN)
- The University of Tokyo (JP)
Publication Details
- Journal
- Science Advances
- Published
- 2025-10-03
- DOI
- https://doi.org/10.1126/sciadv.adu2973
- Citations
- 2
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 2.49
Funders
- University of California, Santa Barbara
- Japan Society for the Promotion of Science