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Journal Article

Effects of pressure on the superconducting properties of magnesium diboride

MPS-Authors
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Chen,  X. J.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Zhang,  H.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;

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Habermeier,  H.-U.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Chen, X. J., Zhang, H., & Habermeier, H.-U. (2002). Effects of pressure on the superconducting properties of magnesium diboride. Physical Review B, 65(14): 144514.


Cite as: https://hdl.handle.net/21.11116/0000-000E-EC89-E
Abstract
We discuss the effects of hydrostatic pressure on the
superconducting properties of MgB2 within the framework of the
Eliashberg theory. By considering the pressure dependences of
all parameters appearing in the McMillan formula, we show that
the calculated pressure derivative of T-c as well as the
variation of T-c with pressure are in good agreement with
recent measurements. The pressure dependences of the energy gap
Delta(0), the effective interaction strength N(E-F)v, the
critical magnetic field H-c(0), and the electronic specific-
heat coefficient gamma are also predicted for this system. A
comparison of the pressure effects in nontransition elements
clearly suggests that MgB2 is an electron-phonon-mediated
superconductor.