Universität zu Köln

Jaoui, Alexandre, Fauque, Benoit, Rischau, Carl Willem, Subedi, Alaska ORCID: 0000-0001-7537-8196, Fu, Chenguang ORCID: 0000-0002-9545-3277, Gooth, Johannes, Kumar, Nitesh, Suess, Vicky, Maslov, Dmitrii L., Felser, Claudia ORCID: 0000-0002-8200-2063 and Behnia, Kamran ORCID: 0000-0001-8997-5645 (2018). Departure from the Wiedemann-Franz law in WP2 driven by mismatch in T-square resistivity prefactors. npj Quantum Mater., 3. LONDON: NATURE PUBLISHING GROUP. ISSN 2397-4648

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Abstract

The Wiedemann-Franz law establishes a link between heat and charge transport due to electrons in solids. The extent of its validity in the presence of inelastic scattering is a question raised in different contexts. Here we report on a study of the electrical, sigma, and thermal, kappa, conductivities in WP2 single crystals. The Wiedemann-Franz law holds at 2 K, but a downward deviation rapidly emerges upon warming. At 13 K, there is an exceptionally large mismatch between the Lorenz number and the Sommerfeld value. We show that this is driven by a fivefold discrepancy between the T-square prefactors of electrical and thermal resistivities, both caused by electron-electron scattering. This implies the existence of abundant small-scattering-angle collisions between electrons, due to strong screening. By quantifying the relative frequency of collisions conserving momentum flux, but degrading heat flux, we identify a narrow temperature window where the hierarchy of scattering times may correspond to the hydrodynamic regime.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Jaoui, Alexandre UNSPECIFIED UNSPECIFIED UNSPECIFIED Fauque, Benoit UNSPECIFIED UNSPECIFIED UNSPECIFIED Rischau, Carl Willem UNSPECIFIED UNSPECIFIED UNSPECIFIED Subedi, Alaska UNSPECIFIED orcid.org/0000-0001-7537-8196 UNSPECIFIED Fu, Chenguang UNSPECIFIED orcid.org/0000-0002-9545-3277 UNSPECIFIED Gooth, Johannes UNSPECIFIED UNSPECIFIED UNSPECIFIED Kumar, Nitesh UNSPECIFIED UNSPECIFIED UNSPECIFIED Suess, Vicky UNSPECIFIED UNSPECIFIED UNSPECIFIED Maslov, Dmitrii L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Felser, Claudia UNSPECIFIED orcid.org/0000-0002-8200-2063 UNSPECIFIED Behnia, Kamran UNSPECIFIED orcid.org/0000-0001-8997-5645 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-162278
DOI:	10.1038/s41535-018-0136-x
Journal or Publication Title:	npj Quantum Mater.
Volume:	3
Date:	2018
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2397-4648
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THERMAL-CONDUCTIVITY; ELECTRON-SCATTERING; TRANSPORT Multiple languages Materials Science, Multidisciplinary; Quantum Science & Technology; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16227