Dependence of the Superconducting Transition Temperature of MgB2 on Pressure to 20 GPa

Details Dependence of the Superconducting Transition Temperature of MgB2 on Pressure to 20 GPa Dependence of the Superconducting Transition Temperature of MgB2 on Pressure to 20 GPa

2001-06-05

arxiv.org/abs/cond-mat/0106057v1

Physica C 361, 227 (2001)

Physics

Condensed Matter

Superconductivity

9 pages, 3 figures

Scientific paper

10.1016/S0921-4534(01)00939-X

The dependence of Tc on nearly hydrostatic pressure has been measured for an isotopically pure (11B) MgB2 sample in a helium-loaded diamond-anvil-cell to nearly 20 GPa. Tc decreases monotonically with pressure from 39.1 K at ambient pressure to 20.9 K at 19.2 GPa. The initial dependence is the same as that obtained earlier (dTc/dP = -1.11(2) K/GPa) on the same sample in a He-gas apparatus to 0.7 GPa. The observed pressure dependence Tc(P) to 20 GPa can be readily described in terms of simple lattice stiffening within standard phonon-mediated BCS superconductivity.

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