The Dependence of Tc on Hydrostatic Pressure in Superconducting MgB2

Details The Dependence of Tc on Hydrostatic Pressure in Superconducting MgB2 The Dependence of Tc on Hydrostatic Pressure in Superconducting MgB2

2001-03-26

arxiv.org/abs/cond-mat/0103538v2

Phys. Rev. B 64, 092505 (2001)

Physics

Condensed Matter

Superconductivity

revised version of paper submitted for publication on March 26, 2001

Scientific paper

10.1103/PhysRevB.64.092505

The dependence of Tc on hydrostatic (He-gas) pressure has been determined to 0.7 GPa. We find that Tc decreases linearly and reversibly under pressure at the rate dTc/dP = -1.11 +- 0.02 K/GPa. These studies were carried out on the same sample used in earlier structural studies under He-gas pressure which yielded the bulk modulus B = 147.2 +- 0.7 GPa. The value of the logarithmic volume derivative of Tc is thus accurately determined, dlnTc/dlnV = +4.16 +- 0.08, allowing quantitative comparison with theory. The present results support the emerging picture that MgB2 is a BCS superconductor with electron-phonon pairing interaction.

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