| Issue |
EPL
Volume 88, Number 4, November 2009
|
|
|---|---|---|
| Article Number | 47005 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/88/47005 | |
| Published online | 03 December 2009 | |
Enhancement of the Hall-Lorenz number in optimally doped YBa2Cu3O
1
Institute of Low Temperature and Structure Research, Polish Academy of Sciences - P.O. Box 1410, 50-950 Wrocław, Poland, EU
2
Materials Science Division, Argonne National Laboratory - Argonne, IL 60439, USA
Corresponding author: k.rogacki@int.pan.wroc.pl
Received:
27
August
2009
Accepted:
3
November
2009
Electronic heat transport in the normal state of a high-quality single crystal of the 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 
depends weakly on temperature and is about two times larger than the Sommerfeld value of the Lorenz number L0 = 
/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.
PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.72.Bk – Y-based cuprates
© EPLA, 2009
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