1.
Phys Rev Lett
; 84(10): 2219-22, 2000 Mar 06.
Article
in English
| MEDLINE
| ID: mdl-11017248
ABSTRACT
The Wiedemann-Franz (WF) ratio compares the thermal and electrical conductivities in a metal. We describe a new way to determine its value, based on the thermal Hall conductivity. The technique is applied to copper and to untwinned YBaCuO. In the latter, we uncover a T-linear dependence and suppression of the Hall-channel WF ratio. We discuss the implications of this suppression. The general suppression of the WF ratio in systems with predominant electron-electron scattering is discussed.
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