Internal Transition of Superconducting State by Impurity Doping with a Jump of Isotope-effect Coefficient in Multiband Superconductors

Details Internal Transition of Superconducting State by Impurity Doping with a Jump of Isotope-effect Coefficient in Multiband Superconductors Internal Transition of Superconducting State by Impurity Doping with a Jump of Isotope-effect Coefficient in Multiband Superconductors

2003-04-23

arxiv.org/abs/cond-mat/0304516v3

J. Phys. Soc. Jpn. Vol.72, No.8 (2003) pp.1843-1846.

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures (with jpsj2.cls, ver.1.2), v3:linguistic corrections

Scientific paper

10.1143/JPSJ.72.1843

The impurity effects on the transition temperature Tc and the isotope effect are examined in multiband superconductors with magnetic and nonmagnetic impurities, where the effect of Coulomb repulsion is considered. It is shown that an internal transition of the superconducting state is induced by impurity doping, and that the transition is accompanied by a jump of the isotope-effect coefficient alpha. In particular, the transition is illustrated in a system with two electron bands. In some special cases, extended Abrikosov and Gor'kov (AG) equations for Tc and the expressions of the isotope-effect coefficient alpha are obtained. Possible relevance of the present mechanism to the experimental results of Sr2RuO4 is discussed.

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