Multigap superconductivity in Y2C3: A 13C-NMR study

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

Research output: Contribution to journalArticle

25 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 2007
Externally publishedYes

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superconductivity
nuclear magnetic resonance
spin-lattice relaxation
nuclear spin
transition temperature
temperature dependence
magnetic fields

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Multigap superconductivity in Y2C3 : A 13C-NMR study. / Harada, A.; Akutagawa, S.; Miyamichi, Y.; Mukuda, H.; Kitaoka, Y.; Akimitsu, Jun.

In: Journal of the Physical Society of Japan, Vol. 76, No. 2, 023704, 02.2007.

Research output: Contribution to journalArticle

Harada, A, Akutagawa, S, Miyamichi, Y, Mukuda, H, Kitaoka, Y & Akimitsu, J 2007, 'Multigap superconductivity in Y2C3: A 13C-NMR study', Journal of the Physical Society of Japan, vol. 76, no. 2, 023704. https://doi.org/10.1143/JPSJ.76.023704
Harada, A. ; Akutagawa, S. ; Miyamichi, Y. ; Mukuda, H. ; Kitaoka, Y. ; Akimitsu, Jun. / Multigap superconductivity in Y2C3 : A 13C-NMR study. In: Journal of the Physical Society of Japan. 2007 ; Vol. 76, No. 2.
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