Physics – Condensed Matter – Superconductivity
Scientific paper
2001-02-15
Phys. Rev. B 64, 12507 (2001)
Physics
Condensed Matter
Superconductivity
8 pages, 3 figures; submitted to Physical Review B (February 14, 2001; revised March 21, 2001); minor modifications, including
Scientific paper
10.1103/PhysRevB.64.012507
The hydrostatic pressure effect on the newly discovered superconductor MgB2 has been determined. The transition temperature Tc was found to decrease linearly at a large rate of -1.6 K/GPa, in good quantitative agreement with the ensuing calculated value of -1.4 K/GPa within the BCS framework by Loa and Syassen, using the full-potential linearlized augmented plane-wave method. The relative pressure coefficient, dlnTc/dp, for MgB2 also falls between the known values for conventional sp- and d-superconductors. The observation, therefore, suggests that electron-phonon interaction plays a significant role in the superconductivity of the compound.
Chu Cheng-Wei
Lorenz Beat
Meng R. L.
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