Lorenz number in high Tc superconductors:: Evidence for bipolarons -: art. no. 217001

被引：16
|
作者：
Lee, KK
Alexandrov, AS
Liang, WY
机构：
[1] Univ Cambridge, Interdisciplinary Res Ctr Superconduct, Cavendish Lab, Cambridge CB3 0HE, England
[2] Univ Loughborough, Dept Phys, Loughborough LE11 3TU, Leics, England
来源：
PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 21期
关键词：
D O I：
10.1103/PhysRevLett.90.217001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The strong electron-phonon interaction in cuprates has gathered support over the last decade in a number of experiments. While phonons remain almost unrenormalized, electrons are transformed into itinerant bipolarons and thermally excited polarons when the electron-phonon interaction is strong. We calculate the Lorenz number of the system to show that the Wiedemann-Franz law breaks down because of the interference of polaron and bipolaron contributions in the heat flow. The model fits numerically the experimental Hall Lorenz number, which provides direct evidence for bipolarons in the cuprates.
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页数：4
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