Lorenz number in high Tc superconductors: evidence for bipolarons

Details Lorenz number in high Tc superconductors: evidence for bipolarons Lorenz number in high Tc superconductors: evidence for bipolarons

2002-11-28

arxiv.org/abs/cond-mat/0211665v1

Physical Review Letters, 90(21), 2003, pp 217001-1/4

Physics

Condensed Matter

Superconductivity

4 page, 1 figure

Scientific paper

10.1103/PhysRevLett.90.217001

Strong electron-phonon interaction in cuprates has gathered support over the last decade in a number of experiments. While phonons remain almost unrenormalised, electrons are transformed into itinerent 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 a direct evidence for bipolarons in the cuprates.

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