Pressure dependence of Tc in the MgB2 superconductor as probed by resistivity measurements

Details Pressure dependence of Tc in the MgB2 superconductor as probed by resistivity measurements Pressure dependence of Tc in the MgB2 superconductor as probed by resistivity measurements

2001-02-28

arxiv.org/abs/cond-mat/0102511v1

Physics

Condensed Matter

Materials Science

6 pages, 2 figures

Scientific paper

10.1088/0953-8984/13/12/102

High-pressure resistivity experiments were performed on the recently discovered superconductor, MgB2. Tc decreases quasi-linearly with applied pressure to 1.4 GPa at a rate of -2.0(1) K/GPa, which is somewhat larger than that derived from recently-reported ac susceptibility measurements. The reduction of Tc is consistent with the BCS picture, in a similar way to the C60-based superconductors. Taking into account the pressure dependence of the unit cell volume, V, the volume coefficient of Tc, d(lnTc)/dV is significantly large.

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