TY - JOUR
T1 - Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3 Oy
AU - Grissonnanche, G.
AU - Laliberté, F.
AU - Dufour-Beauséjour, S.
AU - Matusiak, M.
AU - Badoux, S.
AU - Tafti, F. F.
AU - Michon, B.
AU - Riopel, A.
AU - Cyr-Choinière, O.
AU - Baglo, J. C.
AU - Ramshaw, B. J.
AU - Liang, R.
AU - Bonn, D. A.
AU - Hardy, W. N.
AU - Krämer, S.
AU - LeBoeuf, D.
AU - Graf, D.
AU - Doiron-Leyraud, N.
AU - Taillefer, Louis
PY - 2016/2/22
Y1 - 2016/2/22
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84959562403&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.93.064513
DO - 10.1103/PhysRevB.93.064513
M3 - Article (Academic Journal)
AN - SCOPUS:84959562403
SN - 2469-9950
VL - 93
JO - Physical Review B
JF - Physical Review B
IS - 6
M1 - 064513
ER -