Enhancement of the Hall-Lorenz number in optimally doped YBa2Cu3O_7-d

Abstract

Electronic heat transport in the normal state of a high-quality single crystal of optimally-doped superconductor YBa2Cu3O6.95 was studied by measurements of longitudinal and transverse transport coefficients. For the temperature range from 100 to 300 K, the Hall-Lorenz number (Lxy) depends weakly on temperature and is about two times larger than the Sommerfeld value of the Lorenz number Lo = (pi^2)/3. Our results can be interpreted using a Fermi liquid model when effects of the pseudogap that opens at the Fermi level are included. However, we find that the bipolaron model can also explain both the enhanced value and the weak temperature dependence of the Hall-Lorenz number.

Accepted for publication in Europhysics Letters; 16 pages, 2 figures

References in corpus (6)

• Onset of a boson mode at superconducting critical point of underdoped YBa2Cu3Oy
• Heat transport in Bi_{2+x}Sr_{2-x}CuO_{6+δ}: departure from the Wiedemann-Franz law in the vicinity of the metal-insulator transition
• Test of the Wiedemann-Franz law in an optimally-doped cuprate
• Bose-Einstein condensation of strongly correlated electrons and phonons in cuprate superconductors
• The Lorenz number in the optimally doped and underdoped Eu-123 superconductor
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Cited by in corpus (8)

• Holographic quantum matter
• Scaling theory of the cuprate strange metals
• Magneto-transport from momentum dissipating holography
• A hydrodynamical description for magneto-transport in the strange metal phase of Bi-2201
• Violation of the Wiedemann-Franz law as an evidence of the pseudogap in the iron-based superconductor Ba(Fe1-xCox)2As2
• Demystifying the Holographic Mystique
• Die Hard Holographic Phenomenology of Cuprates
• Abnormally enhanced Hall Lorenz number in the magnetic Weyl semimetal NdAlSi