✦ LIBER ✦

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

✍ Scribed by G.A. Ummarino

Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 271 KB
Volume: 423
Category: Article
ISSN: 0921-4534
DOI: 10.1016/j.physc.2005.04.006

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✦ Synopsis

The variation of the superconducting critical temperature T c as a function of the pressure p in the magnesium diboride MgB 2 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 T c versus p curve can be fitted very well and information can be obtained on the dependence of the electron-phonon interaction matrix hI 2 i by pressure. The pressure dependence of the superconductive gaps D r and D p is also predicted.

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