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26 April 2024

» arxiv » 1503.7572

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Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3Oy
G. Grissonnanche ; F. Laliberte ; S. Dufour-Beausejour ; M. Matusiak ; S. Badoux ; F. F. Tafti ; B. Michon ; A. Riopel ; O. Cyr-Choiniere ; J. C. Baglo ; B. J. Ramshaw ; R. Liang ; D. A. Bonn ; W. N. Hardy ; S. Kramer ; D. LeBoeuf ; D. Graf ; N. Doiron-Leyraud ; L. Taillefer ;
Date:	25 Mar 2015
Abstract:	The recent detection of charge-density modulations in YBa2Cu3Oy and other cuprate superconductors raises new questions about the normal state of underdoped cuprates. In one class of theories, the modulations are intertwined with pairing in a dual state, expected to persist up to high magnetic fields as a vortex liquid. In support of such a state, specific heat and magnetisation data on YBa2Cu3Oy have been interpreted in terms of a vortex liquid persisting above the vortex-melting field Hvs at T = 0. Here we report high-field measurements of the electrical and thermal Hall conductivities in YBa2Cu3O6.54 that allow us to probe the Wiedemann-Franz law, a sensitive test of the presence of superconductivity in a metal. In the T = 0 limit, we find that the law is satisfied for fields immediately above Hvs. This rules out the existence of a vortex liquid and it places strict constraints on the nature of the normal state in underdoped cuprates.
Source:	arXiv, 1503.7572
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