Multigap superconductivity in Y2C3: A 13C-NMR study

A. Harada, S. Akutagawa, Y. Miyamichi, H. Mukuda, Y. Kitaoka, J. Akimitsu

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We report on the superconducting properties of Y2C3 with a relatively high transition temperature Tc = 15.7 K investigated by 13C nuclear-magnetic-resonance (NMR) measurements under a magnetic field. The 13C Knight shift has revealed a significant decrease below Tc, suggesting a spin-singlet superconductivity. From an analysis of the temperature dependence of the nuclear spin-lattice relaxation rate 1/T1 in the superconducting state, Y2C3 is demonstrated to be a multigap superconductor that exhibits a large gap 2Δ/kBTc = 5 at the main band and a small gap 2Δ/kBTc = 2 at other bands. These results have revealed that Y2C3 is a unique multigap s-wave superconductor similar to MgB2.

Original languageEnglish
Article number023704
Journaljournal of the physical society of japan
Volume76
Issue number2
DOIs
Publication statusPublished - Feb 1 2007
Externally publishedYes

Keywords

  • Lanthanoid carbide
  • Metal
  • Multigap
  • NMR
  • Superconductivity
  • YC

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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