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Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3Oy

Title: Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3Oy.
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Name(s): Grissonnanche, G., author
Laliberte, F., author
Dufour-Beausejour, S., author
Matusiak, M., author
Badoux, S., author
Tafti, F. F., author
Michon, B., author
Riopel, A., author
Cyr-Choiniere, O., author
Baglo, J. C., author
Ramshaw, B. J., author
Liang, R., author
Bonn, D. A., author
Hardy, W. N., author
Kraemer, S., author
LeBoeuf, D., author
Graf, D., author
Doiron-Leyraud, N., author
Taillefer, Louis, author
Type of Resource: text
Genre: Text
Date Issued: 2016-02-22
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The electrical and thermal Hall conductivities of the cuprate superconductor YBa2Cu3Oy, sigma(xy) and kappa(xy), 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, kappa(xy)/T = (pi(2)/3)(k(B)/e)(2)sigma(xy), is satisfied for fields immediately above the vortex-melting field H-vs. 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, L-xy = kappa(xy)/(sigma T-xy), decreases rapidly, indicating that strong small-q scattering processes are involved.
Identifier: FSU_libsubv1_wos_000370793000005 (IID), 10.1103/PhysRevB.93.064513 (DOI)
Keywords: charge order, density-wave order, enhancement, fermi-surface, high-temperature superconductor, quantum oscillations, single-crystals, stripe order, t-c superconductor, upper critical-field
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1103/PhysRevB.93.064513
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000370793000005
Owner Institution: FSU
Is Part Of: Physical Review B.
2469-9950
Issue: iss. 6, vol. 93

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Grissonnanche, G., Laliberte, F., Dufour-Beausejour, S., Matusiak, M., Badoux, S., Tafti, F. F., … Taillefer, L. (2016). Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3Oy. Physical Review B. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000370793000005