Dependence of the superconducting transition temperature of single- and polycrystalline MgB2 on hydrostatic pressure

Details Dependence of the superconducting transition temperature of single- and polycrystalline MgB2 on hydrostatic pressure Dependence of the superconducting transition temperature of single- and polycrystalline MgB2 on hydrostatic pressure

2002-09-11

arxiv.org/abs/cond-mat/0209270v1

Physica C 385, 105 (2003)

Physics

Condensed Matter

Superconductivity

Invited paper for a special edition of Physica on MgB2

Scientific paper

10.1016/S0921-4534(02)02300-6

The dependence of Tc for MgB2 on purely hydrostatic or nearly hydrostatic pressure has been determined to 23 GPa for single-crystalline and to 32 GPa for polycrystalline samples, and found to be in good agreement. Tc decreases from 39 K at ambient pressure to 15 K at 32 GPa with an initial slope dTc/dP = -1.11(2) K/GPa. Evidence is presented that the differing values of dTc/dP reported in the literature result primarily from shear-stress effects in nonhydrostatic pressure media and not differences in the samples. Although comparison of these results with theory supports phonon-mediated superconductivity, a critical test of theory must await volume-dependent calculations based on the solution of the anisotropic Eliashberg equations.

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