Anisotropic Upper Critical Field in Single Crystal MgB2 |
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| Authors: | K Maki A I Posazhennikova T Dahm |
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| Affiliation: | (1) Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484, USA;(2) Laboratorium voor Vaste-Stoffisica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium;(3) Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany |
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| Abstract: | Recent experiments on MgB2 single crystals appear to indicate that superconductivity in this material is described not only by two superconducting order parameters attached to the  band and the  band, respectively, but also these two order parameters have different anisotropy. More explicitly the anisotropy of H
c2(t) requires an oblate order parameter in momentum space attached to the a band while H
c1(t) is described by a prolate order parameter, attached to the band. Therefore the vortex state in MgB2 should be described by an interplay of these two superconducting order parameters. |
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