Departure from the Wiedemann–Franz law in WP2 driven by mismatch in T-square resistivity prefactors
In: Npj Quantum Materials Npj Quantum Materials, Nature publishing, 2018, 3 (1), pp.33-43. ⟨10.1038/s41535-018-0136-x⟩ npj, Jg. 3 (2018), Heft 1, S. 1-7
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Zugriff:
The Wiedemann-Franz (WF) law establishes a link between heat and charge transport due to electrons in solids. The extent of its validity in presence of inelastic scattering is a question raised in different contexts. We report on a study of the electrical, $\sigma$, and thermal, $\kappa$, conductivities in WP$_2$ single crystals. The WF holds at 2 K, but a downward deviation rapidly emerges upon warming. At 13 K, there is an exceptionally large mismatch between 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.
Comment: 14 pages, 7 Figures, Supplemental 6 pages, 5 figures
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Departure from the Wiedemann–Franz law in WP2 driven by mismatch in T-square resistivity prefactors
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| Autor/in / Beteiligte Person: | Kumar, Nitesh ; Subedi, Alaska ; Carl Willem Rischau ; Jaoui, Alexandre ; Maslov, Dmitrii L. ; Behnia, Kamran ; Felser, Claudia ; Fu, Chenguang ; Fauqué, Benoît. ; Gooth, Johannes ; Süß, Vicky ; Jeunes Équipes de l'Institut de Physique du Collège de France (JEIPCdF) ; Collège de France (CdF (institution))-Centre National de la Recherche Scientifique (CNRS) ; Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM) ; Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) ; Department of Quantum Matter Physics, University of Geneva ; École polytechnique (X) ; Chaire Physique de la matière condensée (A. Georges) ; Collège de France (CdF (institution)) ; Max Planck Institute for Chemical Physics of Solids (CPfS) ; Max-Planck-Gesellschaft ; University of Florida [Gainesville] (UF) ; II. Physikalisches Institut [Köln] ; Universität zu Köln |
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| Zeitschrift: | Npj Quantum Materials Npj Quantum Materials, Nature publishing, 2018, 3 (1), pp.33-43. ⟨10.1038/s41535-018-0136-x⟩ npj, Jg. 3 (2018), Heft 1, S. 1-7 |
| Veröffentlichung: | HAL CCSD, 2018 |
| Medientyp: | unknown |
| ISSN: | 2397-4648 (print) |
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