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arXiv · 2508.12667

Anomalous Nernst Effect and Its Implications for Time-Reversal Symmetry Breaking in Kagome Metal ScV6Sn6

Yazhou Li·Saizheng Cao·Jiaxing Liao·Jiajun Ma·Yuwei Zhang·Tao Li·Jialu Wang·Chenchao Xu·Jianhui Dai·Chao Cao·Yu Song·Peijie Sun·Yuke Li
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Abstract

The nonmagnetic kagome metal ScV6Sn6 displays an unconventional charge order (CO) accompanied by signatures of an anomalous Hall effect, hidden magnetism, and multiple lattice instabilities. In this study, we report the observation of unconventional anomalous thermoelectric properties. Notably, unexpected anomalous transverse Nernst signals reach a peak value of ~4 μV/K near the TCDW ~92 K in ScV6Sn6, and these signals persist in the charge-ordered state as the temperature decreases to 10 K. Furthermore, both thermopower and thermal conductivity exhibit significant changes under magnetic fields, even in the nonmagnetic ground state. These observations strongly suggest the emergence of time-reversal symmetry breaking in ScV6Sn6, as supported by muon spin relaxation (μSR) measurements. While hidden magnetism represents the most plausible origin, alternative mechanisms involving orbital currents and chiral charge order remain possible.

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Yazhou Li, Saizheng Cao, Jiaxing Liao, Jiajun Ma, Yuwei Zhang, Tao Li, Jialu Wang, Chenchao Xu, Jianhui Dai, Chao Cao, Yu Song, Peijie Sun, Yuke Li. 2025-08-18. Anomalous Nernst Effect and Its Implications for Time-Reversal Symmetry Breaking in Kagome Metal ScV6Sn6. https://doi.org/10.1007/s11433-025-2767-6

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