Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3 Oy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • G. Grissonnanche
  • F. Laliberté
  • S. Dufour-Beauséjour
  • M. Matusiak
  • S. Badoux
  • F. F. Tafti
  • 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

Detail(s)

Original languageEnglish
Article number064513
Journal / PublicationPhysical Review B
Volume93
Issue number6
Publication statusPublished - 22 Feb 2016
Externally publishedYes

Abstract

The electrical and thermal Hall conductivities of the cuprate superconductor YBa2Cu3Oy, σxy and κxy, were measured in a magnetic field up to 35 T, at a hole concentration (doping) p=0.11. In the T=0 limit, we find that the Wiedemann-Franz law, κxy/T=(π2/3)(kB/e)2σxy, is satisfied for fields immediately above the vortex-melting field Hvs. This rules out the existence of a vortex liquid at T=0 and it puts a clear constraint on the nature of the normal state in underdoped cuprates, in a region of the doping phase diagram where charge-density-wave order is known to exist. As the temperature is raised, the Lorenz ratio, Lxy=κxy/(σxyT), decreases rapidly, indicating that strong small-q scattering processes are involved.

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Citation Format(s)

Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3 Oy. / Grissonnanche, G.; Laliberté, F.; Dufour-Beauséjour, S.; Matusiak, M.; Badoux, S.; Tafti, F. F.; Michon, B.; Riopel, A.; Cyr-Choinière, O.; Baglo, J. C.; Ramshaw, B. J.; Liang, R.; Bonn, D. A.; Hardy, W. N.; Krämer, S.; LeBoeuf, D.; Graf, D.; Doiron-Leyraud, N.; Taillefer, Louis.

In: Physical Review B, Vol. 93, No. 6, 064513, 22.02.2016.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review