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

Abstract

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.

9 pages, 3 figures

References in corpus (6)

• Phonon Density-of-States in MgB2
• Lattice Properties of MgB2 versus Temperature and Pressure
• High Pressure Study on MgB2
• Calculated elastic and electronic properties of MgB${}_2$ at high pressures
• The Dependence of Tc on Hydrostatic Pressure in Superconducting MgB2
• Pressure dependence of Tc in the MgB2 superconductor as probed by resistivity measurements

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• Superconductivity of barium-VI synthesized via compression at low temperatures
• Pressure dependence of critical temperature in MgB2 and two bands Eliashberg theory
• Pressure-induced superconductivity in the giant Rashba system BiTeI