Universität zu Köln

Xu, Liangcai ORCID: 0000-0003-4366-3392, Li, Xiaokang ORCID: 0000-0001-8828-5044, Lu, Xiufang, Collignon, Clement ORCID: 0000-0002-1697-4331, Fu, Huixia ORCID: 0000-0002-4498-6946, Koo, Jahyun, Fauque, Benoit, Yan, Binghai ORCID: 0000-0003-2164-5839, Zhu, Zengwei and Behnia, Kamran ORCID: 0000-0001-8997-5645 (2020). Finite-temperature violation of the anomalous transverse Wiedemann-Franz law. Sci. Adv., 6 (17). WASHINGTON: AMER ASSOC ADVANCEMENT SCIENCE. ISSN 2375-2548

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Abstract

The Wiedemann-Franz (WF) law has been tested in numerous solids, but the extent of its relevance to the anomalous transverse transport and the topological nature of the wave function, remains an open question. Here, we present a study of anomalous transverse response in the noncollinear antiferromagnet Mn3Ge extended from room temperature down to sub-kelvin temperature and find that the anomalous Lorenz ratio remains close to the Sommerfeld value up to 100 K but not above. The finite-temperature violation of the WF correlation is caused by a mismatch between the thermal and electrical summations of the Berry curvature and not by inelastic scattering. This interpretation is backed by our theoretical calculations, which reveals a competition between the temperature and the Berry curvature distribution. The data accuracy is supported by verifying the anomalous Bridgman relation. The anomalous Lorenz ratio is thus an extremely sensitive probe of the Berry spectrum of a solid.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Xu, Liangcai UNSPECIFIED orcid.org/0000-0003-4366-3392 UNSPECIFIED Li, Xiaokang UNSPECIFIED orcid.org/0000-0001-8828-5044 UNSPECIFIED Lu, Xiufang UNSPECIFIED UNSPECIFIED UNSPECIFIED Collignon, Clement UNSPECIFIED orcid.org/0000-0002-1697-4331 UNSPECIFIED Fu, Huixia UNSPECIFIED orcid.org/0000-0002-4498-6946 UNSPECIFIED Koo, Jahyun UNSPECIFIED UNSPECIFIED UNSPECIFIED Fauque, Benoit UNSPECIFIED UNSPECIFIED UNSPECIFIED Yan, Binghai UNSPECIFIED orcid.org/0000-0003-2164-5839 UNSPECIFIED Zhu, Zengwei UNSPECIFIED UNSPECIFIED UNSPECIFIED Behnia, Kamran UNSPECIFIED orcid.org/0000-0001-8997-5645 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-338516
DOI:	10.1126/sciadv.aaz3522
Journal or Publication Title:	Sci. Adv.
Volume:	6
Number:	17
Date:	2020
Publisher:	AMER ASSOC ADVANCEMENT SCIENCE
Place of Publication:	WASHINGTON
ISSN:	2375-2548
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33851