Temperature dependence and anisotropy of the bulk upper critical field Hc2 of MgB₂
Sologubenko, A. V. · Jun, J. · Kazakov, S. M. · Karpinski, J. · Ott, H. R.
الأصل · EN
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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