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Title: Lorenz number in high Tc superconductors: evidence for bipolarons
Authors: Lee, K.K.
Alexandrov, A.S.
Liang, W.Y.
Keywords: superconductivity
strongly correlated electrons
Issue Date: 2002
Abstract: Strong electron-phonon interaction in the 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.
Description: This is a pre-print. The definitive version: LEE, ALEXANDROV and LIANG, 2003. Lorenz number in high Tc superconductors: evidence for bipolarons. Physical Review Letters, 90(21), is available at: http://prl.aps.org/.
URI: https://dspace.lboro.ac.uk/2134/1135
Appears in Collections:Pre-Prints (Physics)

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