Temperature dependence and anisotropy of the bulk upper critical field Hc2 of MgB2
Abstract
The bulk upper critical field Hc2(T) of superconducting MgB2 and its anisotropy are established by analyzing experimental data on the temperature and magnetic field dependences of the ab-plane thermal conductivity of a single-crystalline sample in external magnetic fields oriented both parallel (Hc2c) and perpendicular (Hc2ab) to the c axis of the hexagonal lattice. From numerical fits we deduce the anisotropy ratio γ0 = Hc2ab(0) / Hc2c(0)=4.2 at T=0 K. Both the values and the temperature dependences of Hc2c and Hc2ab are distinctly different from previous claims based on measurements of the electrical resistivity.
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