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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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
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Language:English
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Condensed Matter
Physics
Superconductivity
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cited_by cdi_FETCH-LOGICAL-c316t-a0ea818b076e621c3abe6717cbb1e77e4434521a2ec12b1036eea412c45940a13
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container_end_page 142
container_issue 1-2
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container_title Physica. C, Superconductivity
container_volume 387
creator Welp, U
Rydh, A
Karapetrov, G
Kwok, W.K
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Kim, K.H.P
Jung, C.U
Lee, H.-S
Kang, B
Lee, S.-I
description 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.
doi_str_mv 10.1016/S0921-4534(03)00659-2
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subjects Condensed Matter
Physics
Superconductivity
title Superconducting phase diagram of single crystal MgB2
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