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Two band superconductivity in Eliashberg model for MgB2

E. V. MACOCIAN1,*

Affiliation

  1. Department of Physics, University of Oradea, Oradea, Romania

Abstract

The superconductivity in 2 MgB is analyzed inside a two band model. The model consists in self-consistent calculation of the gap and effective mass renormalization functions of Eliashberg equations. We present the frequency dependence of the two functions, and the temperature dependence of the two energy gaps, revealing the superconducting transition temperature c T . The results show the role of the strong electron – phonon coupling in superconductivity of 2 MgB via high frequency phonons of 2g E mode. The superconductivity mainly originates in the quasi 2D σ band, being driven from interaction inside the boron layer. The out of plane interaction is weaker and the 3D π band has a smaller contribution to superconductivity..

Keywords

Two band superconductivity, MgB2 , Eliashberg equations.

Submitted at: Dec. 2, 2005
Accepted at: May 18, 2006

Citation

E. V. MACOCIAN, Two band superconductivity in Eliashberg model for MgB2, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1156-1160 (2006)