Abstract
The relative enthalpy of YBa2Cu3O7−δ has been measured between the temperatures 273 and 700 K. From these data, we find that the electronic contribution to the specific heat is linear in temperature with a Sommerfeld constant of 25±3 mJ/mole. K2. We analyze the data to show that the normal state of YBa2Cu3O7−δ is described by two conduction bands and strong electron-phonon coupling. The electron-phonon coupling is, in fact, sufficient to account for the highT c in YBa2Cu3O7−δ .
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We are grateful to W. Reichardt for providing the neutron scattering data for estimating the phonon density of states from the neutron density of states. We thank J. L. Cohn, G. Deutscher, W. E. Pickett, and R. A. MacDonald for many helpful discussions. Finally, one of the authors (MER) acknowledges support from the National Research Council. SAW thanks ONR and DARPA for support. The research on VZK was supported by the U.S. Office of Naval Research under contract DE-AC03-76S-F00098.
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Reeves, M.E., Kresin, V.Z. & Wolf, S.A. Thermodynamic determination of the electron-phonon coupling strength in YBa2Cu3O7−δ . J Supercond 7, 257–259 (1994). https://doi.org/10.1007/BF00730407
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DOI: https://doi.org/10.1007/BF00730407