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Published Online March 8, 2001
Science DOI: 10.1126/science.1059775

Reports

Submitted on February 12, 2001
Accepted on February 22, 2001

Pressure Dependence of the Superconducting Transition Temperature of Magnesium Diboride

M. Monteverde 1, M. Núñez-Regueiro 1*, N. Rogado 2, K. A. Regan 2, M. A. Hayward 2, T. He 2, S. M. Loureiro 2, R. J. Cava 2

1 Centre de Recherches sur les Très Basses Températures, CNRS, BP166 Cedex 09, 38042 Grenoble, France.
2 Department of Chemistry and Materials Institute, Princeton University, Princeton, NJ 08544, USA.

* To whom correspondence should be addressed. E-mail: nunez{at}polycnrs-gre.fr.

We studied the pressure and temperature dependence of the electrical resistivity of the superconducting compound magnesium diboride (MgB2). The superconducting transition temperature decreases monotonically with pressure, being parabolic or linear, depending on samples. The rate of decrease under pressure is higher than in conventional superconductors. We discuss our results in terms of the semimetallic character of the electronic band structure of MgB2.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Superconductivity in Boron.
M. I. Eremets, V. V. Struzhkin, H.-k. Mao, and R. J. Hemley (2001)
Science 293, 272-274
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Science. ISSN 0036-8075 (print), 1095-9203 (online)