Effect of density of state on isotope effect exponent of two-band superconductors

Details Effect of density of state on isotope effect exponent of two-band superconductors Effect of density of state on isotope effect exponent of two-band superconductors

2005-07-04

arxiv.org/abs/cond-mat/0507069v1

Physics

Condensed Matter

Superconductivity

11 pages. accepted in Physica C

Scientific paper

10.1016/j.physc.2005.07.001

The exact formula of Tc's equation and the isotope effect exponent of two-band s-wave superconductors in weak-coupling limit are derived by considering the influence of two kinds of density of state : constant and van Hove singularity. The pairing interaction in each band consisted of 2 parts : the electron-phonon interaction and non-electron-phonon interaction are included in our model. We find that the interband interaction of electron-phonon show more effect on isotope exponent than the intraband interaction and the isotope effect exponent with constant density of state can fit to an experimental data,MgB2, and high-Tc superconductors, better than van Hove singularity density of state.

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