Zhang Y, Ong N P, Xu Z A, Krishana K, Gagnon R, Taillefer L
Joseph Henry Laboratories of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Phys Rev Lett. 2000 Mar 6;84(10):2219-22. doi: 10.1103/PhysRevLett.84.2219.
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.
维德曼-弗兰兹（WF）比率用于比较金属中的热导率和电导率。我们描述了一种基于热霍尔电导率来确定其值的新方法。该技术应用于铜和非孪晶YBaCuO。在后者中，我们发现了霍尔通道WF比率的T线性依赖性和抑制现象。我们讨论了这种抑制的影响。还讨论了在具有主要电子-电子散射的系统中WF比率的普遍抑制情况。
