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Anomalous upper critical field in ternary iron-silicide superconductor Lu2Fe3Si5

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
469
Identifiers
DOI: 10.1016/j.physc.2009.05.099
Keywords
  • Two-Gap Superconductor
  • Upper Critical Field
  • Lu2Fe3Si5
  • Mgb2
Disciplines
  • Physics

Abstract

Abstract We report the upper critical field H c 2 in a ternary iron-silicide superconductor Lu 2Fe 3Si 5 with T c ∼ 6 K obtained by the resistivity measurements. We find that H c 2 increases linearly with decreasing temperature down to T c /3, and H c 2( T = 0) exceeds the orbital depairing field described by the Werthamer–Helfand–Hohenberg theory. We also find that the anisotropy of H c 2 is nearly independent of temperature and the angular dependence of H c 2 is well-described by the anisotropic Ginzburg–Landau model. These results strongly indicate the presence of two distinct superconducting gaps in Lu 2Fe 3Si 5 although the behavior is slightly different from that of the typical two-gap superconductor MgB 2.

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