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

✍ Scribed by P. Udomsamuthirun; C. Kumvongsa; A. Burakorn; P. Changkanarth; S. Yoksan

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
145 KB
Volume
425
Category
Article
ISSN
0921-4534

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✦ Synopsis

The exact formula of T c Γ•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 paring interaction in each band consisted of two parts: the electron-phonon interaction and nonelectron-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 experimental data, MgB 2 and high-T c superconductor, better than van Hove singularity density of state.

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