Effects of pressure on the superconducting properties of magnesium diboride

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.