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Abstract:
We discuss the effects of hydrostatic pressure on the
superconducting properties of MgB2 within the framework of the
Eliashberg theory. By considering the pressure dependences of
all parameters appearing in the McMillan formula, we show that
the calculated pressure derivative of T-c as well as the
variation of T-c with pressure are in good agreement with
recent measurements. The pressure dependences of the energy gap
Delta(0), the effective interaction strength N(E-F)v, the
critical magnetic field H-c(0), and the electronic specific-
heat coefficient gamma are also predicted for this system. A
comparison of the pressure effects in nontransition elements
clearly suggests that MgB2 is an electron-phonon-mediated
superconductor.
