Superconductor Debye temperature

Keywords Phase transition temperature Debye temperature High-temperature superconductor. 

As a further test as to whether the behavior is conventionally superconducting or not, the isotope effect of organic superconductors has been studied at length. Prom the simple BCS formula (2.6) it follows that should increase with increasing Debye temperature which is to a first approximation proportional to (see also Chap. 1). However, the results of isotope... 

There have been a limited number of theoretical Investigations on phonon frequencies and eigenvectors of the La. (Ba,Sr) CuO, [29-31] and YBa2Cu.O. - [32-35] superconductors. Unscreened lattice dynamical models [30,35], yielding only the bare phonon frequencies, gave fair agreement with experimentally determined total phonon density of states, mean square atomic vibrational amplitudes and Debye temperatures. Weber [29] has shown that the effect of... 

Electron-phonon coupling constants X as calculated within the rigid muffin-tin approximation for heavy-fermion superconductors. The appropriate references, as well as the assumed Debye temperatures, are listed in the text. Also tabulated are the mass renormalization factors, which are the ratio of the specific heat y to the band density of states. 

Essential parts of the BCS theory can be taken over in the mean-field theory of the Peierls transition if one replaces the Debye energy tkoo in the superconductor by the Fermi energy Ep in the metal. Since Eplhrop, 10 -100, the Peierls phase transition temperatures are considerably higher than the critical temperatures of BCS superconductors, ii) The frequency of the phonons which are responsible for the Peierls transition has, for T > the temperature dependence... 

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