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.
| Original language | English |
|---|---|
| Article number | eadu2973 |
| Pages (from-to) | 1-7 |
| Number of pages | 7 |
| Journal | Science Advances |
| Volume | 11 |
| Issue number | 40 |
| DOIs | |
| State | Published - 2025 |
Funding
We thank Y. Kasahara, H. Kontani, Y. Matsuda, T. Matsushita, and R. Tazai for useful discussions. We acknowledge Y. Hashimoto in Q-NanoLabo in ISSP, The University of Tokyo for the technical assistance. We thank V. Mosser for the help in design and fabrication of micro-Hall array sensors. This work was supported by Grants-in-Aid for Scientific Research (KAKENHI) (numbers JP22KF0111, JP23K25813, JP22H00105, and JP23H00089) and Grant-in-Aid for Transformative Research Areas (A) “Correlation Design Science” (KAKENHI grant no. JP25H01248) from JSPS. J.Y. was supported by Grant-in-Aid for JSPS Fellows. S.D.W., B.R.O., and Y.M.O. gratefully acknowledge support via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under award DMR-1906325. Work by B.R.O. was supported by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering Division. Acknowledgments: We thank Y. Kasahara, h. Kontani, Y. Matsuda, t. Matsushita, and R. tazai for useful discussions. We acknowledge Y. hashimoto in Q-nanolabo in iSSP, the University of tokyo for the technical assistance. We thank v. Mosser for the help in design and fabrication of micro-hall array sensors. Funding: this work was supported by Grants-in-Aid for Scientific Research (KAKenhi) (numbers JP22KF0111, JP23K25813, JP22h00105, and JP23h00089) and Grant-in-Aid for transformative Research Areas (A) “correlation design Science”(KAKenhi grant no. JP25h01248) from JSPS. J.Y. was supported by Grant-in-Aid for JSPS Fellows. S.d.W., B.R.O., and Y.M.O. gratefully acknowledge support via the Uc Santa Barbara nSF Quantum Foundry funded via the Q-AMASe-i program under award dMR-1906325. Work by B.R.O. was supported by the US department of energy (dOe), Office of Science, Basic energy Sciences (BeS), Materials Sciences and engineering division. Author contributions: h.Y. and M.Y. conceived the project. h.Y., h.t., J.Y., Y.K., and M.Y. performed the electric-transport, thermal-transport, and heat capacity measurements. h.Y., Y.K., M.K., K.i., and t.S. performed the micro-hall array measurements. B.R.O., Y.M.O., and S.d.W. synthesized the single crystals. All authors discussed the results and were involved in writing the paper. Competing interests: the authors declare that they have no competing interest. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials.
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