Wiedemann-Franz law in the underdoped cuprate superconductorYBa2Cu3Oy

• DOI: 10.1103/physrevb.93.064513
• Publication Date: 2016-02-22T17:08:26Z
• Authors: G. Grissonnanche; F. Laliberté; S. Dufour-Beauséjour; M. Matusiak; S. Badoux; F. F. Tafti; B. Michon; A. Riopel; O. Cyr-Choinière; J. C. Baglo; B. J. Ramshaw; R. Liang; D. A. Bonn; W. N. Hardy; S. Krämer; D. LeBoeuf; D. Graf; N. Doiron-Leyraud; Louis Taillefer
• Keywords: 0301 basic medicine; Condensed Matter - Superconductivity; 500; FOS: Physical sciences; 530; 01 natural sciences; [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con]; Superconductivity (cond-mat.supr-con); 03 medical and health sciences; 0103 physical sciences; [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]

The recent detection of charge-density modulations in YBa2Cu3Oy and other cuprate superconductors raises new questions about the normal state underdoped cuprates. In one class theories, are intertwined with pairing a dual state, expected to persist up high magnetic fields as vortex liquid. support such specific heat magnetisation data on have been interpreted terms liquid persisting above vortex-melting field Hvs at T = 0. Here we report high-field measurements electrical thermal Hall conductivities YBa2Cu3O6.54 that allow us probe Wiedemann-Franz law, sensitive test presence superconductivity metal. 0 limit, find law is satisfied for immediately Hvs. This rules out existence it places strict constraints nature