Observation of anomalous thermal Hall effect in a Kagome superconductor

IF 12.5 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2025-10-03 DOI:10.1126/sciadv.adu2973

Hiroki Yoshida, Hikaru Takeda, Jian Yan, Yui Kanemori, Brenden R. Ortiz, Yuzki M. Oey, Stephen D. Wilson, Marcin Konczykowski, Kota Ishihara, Takasada Shibauchi, Minoru Yamashita

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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.

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Kagome超导体中反常热霍尔效应的观察

超导体中破缺的时间反转对称性（TRS）不仅会引起库珀对有限角动量的自发磁化，而且还会引起异常热霍尔效应（ATHEs），这是一个极具挑战性的探测问题。在这里，我们报道了在kagome晶格超导体CsV 3sb5中，在零磁场下，在超导转变温度以下发展的ATHE的成功观察。通过使用相同的装置，在传统的ii型超导体中没有信号，并通过微霍尔阵列测量排除了困涡效应，这一发现得到了验证。观察到的温度依赖性和异常热霍尔电导率的大小与本征热边电流量子化的预期值有很大不同，但与手性超导中外来杂质诱导的异常热霍尔电导率一致。我们对ATHE的研究提供了另一种方法来探测超导状态下的TRS断裂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.