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Effect of pressure on the superconducting transition temperature of doped and neutron-damaged MgB2

S. L. Bud'ko·R. H. T. Wilke·M. Angst·P. C. Canfield
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Abstract

Measurements of the superconducting transition temperatures for Al-doped, C-doped and neutron-damaged-annealed MgB2 samples under pressure up to ~8 kbar are presented. The dT_c/dP values change systematically with the decrease of the ambient pressure T_c in a regular fashion. The evolution of the pressure derivatives can be understood assuming that the change in phonon spectrum is a dominant contribution to dT_c/dP.

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S. L. Bud'ko, R. H. T. Wilke, M. Angst, P. C. Canfield. 2004-11-05. Effect of pressure on the superconducting transition temperature of doped and neutron-damaged MgB2. https://doi.org/10.1016/j.physc.2005.02.001

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