Condensed Matter Physics Seminar
2 p.m., Thursday, May 10, 2001
Room 1201, Physics Building
Superconductivity in MgB2
Igor Mazin
(Center for Computational Materials Science, Naval Research Laboratory,
Washington, DC)
Abstract: I will describe current experimental and theoretical
situation with the superconductivity in magnesium diboride. Lacking
single crystals, little can be said about the mechanism with definiteness.
However, most of the results agree with an s-wave phonon-induced superconductivity.
Nevertheless, there are indications that the actual physics is richer than
one may expect. There are both experimental and theoretical evidences
of substantial anisotropy of the order parameter, and even claims of gap
nodes. Also, theoretical calculations suggest that nonlinear electron-phonon
interaction (i.e., two-phonon exchange) may play a considerable role.
Host: Victor Yakovenko
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