Effect of pressure on the superconducting transition temperature of doped and neutron-damaged MgB$_2$

ORAL

Abstract

Measurements of the superconducting transition temperature for Al-doped, C-doped and neutron-damaged-annealed MgB$_2$ samples under pressure up to $\sim 8$ kbar are presented. The $dT_c/dP$ values change systematically with the decrease of the ambient pressure $T_c$ in a regular fashion for each group of the samples. 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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Authors

  • S.L. Bud'ko

    • Ames Laboratory and Dept. of Physics, Iowa State University
    • Ames Lab and Dept. of Physics and Astronomy, ISU

  • Rudeger H. T. Wilke

  • N. Manuel Angst

  • Paul Canfield

    • Ames Laboratory and Dept. of Physics, Iowa State University