Anomalous upper critical field in ternary iron-silicide superconductor Lu2Fe3Si5

Y. Nakajima, H. Hidaka, T. Tamegai, T. Nishizaki, T. Sasaki, N. Kobayashi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We report the upper critical field Hc2 in a ternary iron-silicide superconductor Lu2Fe3Si5 with Tc ∼ 6 K obtained by the resistivity measurements. We find that Hc2 increases linearly with decreasing temperature down to Tc/3, and Hc2(T = 0) exceeds the orbital depairing field described by the Werthamer-Helfand-Hohenberg theory. We also find that the anisotropy of Hc2 is nearly independent of temperature and the angular dependence of Hc2 is well-described by the anisotropic Ginzburg-Landau model. These results strongly indicate the presence of two distinct superconducting gaps in Lu2Fe3Si5 although the behavior is slightly different from that of the typical two-gap superconductor MgB2.

Original languageEnglish
Pages (from-to)921-923
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - 2009 Oct 15

Keywords

  • LuFeSi
  • MgB
  • Two-gap superconductor
  • Upper critical field

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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