Effects of pressure on the superconducting properties of magnesium diboride

Abstract

We discuss the effects of hydrostatic pressure on the superconducting properties of MgB${}_2$ within the framework of 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 pressure effect in non-transition elements clearly suggests that MgB${}_2$ is an electron-phonon mediated superconductor.

arXiv comment8 pages and 5 figures, accepted for publication in Phys. Rev. B

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• Dependence of the superconducting transition temperature of single- and polycrystalline MgB2 on hydrostatic pressure
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• Superconductivity in sodium-doped T-carbon
• Family of binary transition metal pnictide superconductors
• Study of pressure effect on the magnetic penetration depth in MgB${}_2$
• Pressure dependence of critical temperature in MgB2 and two bands Eliashberg theory
• High pressure Ca-VI phase between 158-180 GPa: Stability, electronic structure and superconductivity
• Majorana Fermions Under Uniaxial Stress in Semiconductor-Superconductor Heterostructures
• Pressure induced evolution of anisotropic superconductivity and Fermi surface nesting in a ternary boride