Superconducting phase diagram of single crystal MgB2

Using magnetization, transport and single-crystal specific heat measurements we have determined the superconducting phase diagram of MgB2. A zero-temperature in-plane coherence length of 9.4 nm is found. The superconducting anisotropy *g changes monotonously from a value around 2 near Tc to above 4....

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2003-05, Vol.387 (1-2), p.137-142
Main Authors: Welp, U, Rydh, A, Karapetrov, G, Kwok, W.K, Crabtree, G.W, Marcenat, Ch, Paulius, L, Klein, T, Marcus, J, Kim, K.H.P, Jung, C.U, Lee, H.-S, Kang, B, Lee, S.-I
Format: Article
Language:English
Subjects:
Condensed Matter
Physics
Superconductivity
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Summary:Using magnetization, transport and single-crystal specific heat measurements we have determined the superconducting phase diagram of MgB2. A zero-temperature in-plane coherence length of 9.4 nm is found. The superconducting anisotropy *g changes monotonously from a value around 2 near Tc to above 4.5 near 22 K. We present strong evidence for a surface superconducting state for H BB c which might account for the wide spread in reported values of the superconducting anisotropy.
ISSN:0921-4534
DOI:10.1016/S0921-4534(03)00659-2