Temperature dependence and anisotropy of the bulk upper critical field Hc2 of MgB2статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.
Аннотация:The bulk upper critical field H-c2(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 (H-c2(c)) and perpendicular (H-c2(ab)) to the c axis of the hexagonal lattice. From numerical fits we deduce the anisotropy ratio gamma(0)=H-c2(ab)(0)/H-c2(c)(0)=4.2 at T=0 K. Both the values and the temperature dependences of H-c2(c) and H-c2(ab) are distinctly different from previous claims based on measurements of the electrical resistivity.