Pressure dependence of critical temperature in MgB2 and two bands Eliashberg theory

Details Pressure dependence of critical temperature in MgB2 and two bands Eliashberg theory Pressure dependence of critical temperature in MgB2 and two bands Eliashberg theory

2004-11-24

arxiv.org/abs/cond-mat/0411603v1

Physics

Condensed Matter

Superconductivity

6 pages, 7 figures

Scientific paper

The variation of the superconducting critical temperature Tc as a function of the pressure p in the magnesium diboride MgB2 has been studied in the framework of two-bands Eliashberg theory and traditional phonon coupling mechanism. I have solved the two-bands Eliashberg equations using first-principle calculations or simple assumptions for the variation, with the pressure, of the relevant physical quantities. I have found that the experimental Tc versus p curve can be fitted very well and information can be obtained on the dependence of the electron-phonon interaction matrix by pressure. The pressure dependence of the superconductive gaps Delta{sigma} and Delta{pi} is also predicted.

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