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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2003     Display Documents

ID: 7468.0, MPI für Festkörperforschung / FKF Publikationen 2003
Superconducting phase diagram of single-crystal MgB2
Authors:Welp, U.; Rydh, A.; Karapetrov, G.; Kwok, W. K.; Crabtree, G. W.; Marcenat, C.; Paulius, L. M.; Lyard, L.; Klein, T.; Marcus, J.; Blanchard, S.; Samuely, P.; Szabó, P.; Jansen, A. G. M.; Kim, K. H. P.; Jung, C. U.; Lee, H. S.; Kang, B.; Lee, S. I.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Physica C
Issue / Number:1-2
Start Page:154
End Page:161
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The superconducting phase diagram of single-crystal MgB2 has
been determined using magnetization, magneto-transport and
specific heat measurements. A value of 9.4 nm is found for the
zero-temperature in-plane coherence length. The superconducting
anisotropy coefficient, gamma, increases monotonously from a
value around 2 near T-c to 4.5 at low temperature. The current
dependence and angular dependence of the resistive transitions
give evidence for a surface superconducting state for H
parallel to c which might account for the wide spread in
reported values of the superconducting anisotropy. (C) 2002
Published by Elsevier Science B.V.
Free Keywords:vortex phase diagram; specific heat; transport; magnetization;
upper critical field; anisotropy; single crystal
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
; CEA Grenoble, SPSMS, Dept Rech Fondamentale Mat Condensee, F-38054 Grenoble, France
; CNRS, Lab Etude Proprietes Solides, F-38042 Grenoble, France
; Slovak Acad Sci, Inst Expt Phys, SK-04353 Kosice, Slovakia
; Max Planck Inst Festkorperforsch, Grenoble High Magnet Field Lab, CNRS, F-38042 Grenoble 9, France
; Pohang Univ Sci & Technol, Dept Phys, NCRICS, Pohang 790784, South Korea
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