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

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

2009-11-04

arxiv.org/abs/0911.0851v1

EPL 88, 47005 (2009)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1209/0295-5075/88/47005

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.

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