Calculated elastic and electronic properties of MgB$_2$ at high pressures

Details Calculated elastic and electronic properties of MgB$_2$ at high pressures Calculated elastic and electronic properties of MgB$_2$ at high pressures

2001-02-26

arxiv.org/abs/cond-mat/0102462v2

Solid State Commun. 118, 279-282 (2001)

Physics

Condensed Matter

Superconductivity

10 pages, 3 figures (EPS), Elsevier LaTeX. More detailed analysis of the pressure dependence of Tc; results unchanged. Manuscr

Scientific paper

10.1016/S0038-1098(01)00095-3

The effect of high pressure on structural and electronic properties of the novel superconductor \MB has been calculated using the full-potential linearized augmented-plane-wave method. Despite the layered crystal structure of \MB nearly isotropic compression (bulk modulus $B_0=140.1(6)$ GPa) is found with only a 1.2% decrease of the $c/a$ ratio at 10 GPa. The effect of pressure on the critical temperature has been estimated on the basis of BCS theory and good agreement with experimental data is found. Our results suggest that it is a combination of increasing phonon frequency and decreasing electronic density of states at the Fermi level which leads to the observed decrease of the critical temperature under pressure.

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