Thomas Lee Elifritz

http://arxiv.org/abs/1205.4978

High superconducting critical temperatures depend universally on the electron-phonon interaction strength, C. Gadermaier, V. V. Kabanov, A. S. Alexandrov, L. Stojchevska, T. Mertelj, C. Manzoni, G. Cerullo, N. D. Zhigadlo, J. Karpinski, Y. Q. Cai, X. Yao, Y. Toda, M. Oda, S. Sugai and D. Mihailovic

Here we show that the superconducting critical temperature T_c of pnictides, cuprates, and bismuthates depends universally on the strength of the electron-phonon interaction as measured by the electron energy relaxation rate, showing a characteristic maximum at ~ 15 ps^-1, T_c > 130 K.

This dependence demonstrates that the electron-phonon interaction is fundamental for the pairing. Among the many scenarios that have been proposed for the high-T_c mechanism, we find that only bipolaronic pairing is consistent with the experimental results.

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