Anisotropic Upper Critical Field in Single Crystal MgB2

Author： Maki K.   Posazhennikova A.I.   Dahm T.  

Publisher： Springer Publishing Company

ISSN： 0022-2291

Source： Journal of Low Temperature Physics, Vol.131, Iss.5-6, 2003-06, pp. : 1199-1204

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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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 σ band and the π band, respectively, but also these two order parameters have different anisotropy. More explicitly the anisotropy of Hc2(t) requires an oblate order parameter in momentum space attached to the a band while Hc1(t) is described by a prolate order parameter, attached to the π band. Therefore the vortex state in MgB2 should be described by an interplay of these two superconducting order parameters.

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