Abstract
The Debye temperature of a superconducting material may provide information about the role of phonons in its superconducting mechanism. In this paper, the void-free acoustic Debye temperature, ΘD, of various cuprate high temperature superconductors, estimated using the acoustic technique, was found to be in the range of 250–500 K. The electron–phonon coupling constant was estimated from the transition temperature Tc using the standard BCS theory and also the two-dimensional van Hove scenario with related characteristic temperature. The van Hove scenario seems to explain the high temperature superconductivity in the cuprates better than the standard three-dimensional BCS model. The Debye temperature of these copper oxide-based superconductors is compared with that of the new binary intermetallic MgB2 superconductor which has been reported to be a phonon-mediated superconductor.
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