Superconductivity of Y2C3 investigated by specific heat measurement

Satoshi Akutagawa, Jun Akimitsu

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18 Citations (Scopus)

Abstract

We report newly synthesized high-purity samples of Y2C 3 with various Tc's (11.6, 13.9, and 15.2 K) and compared their superconducting properties by magnetization and specific heat measurements. From specific heat measurements, the fitting below Tc to the electron specific heat of each sample has an exp(-1/T) dependence, as predicted by BCS theory, rather than a Tn dependence, as for superconductors with an anisotropic symmetry of superconductivity. These results indicate that the symmetry of the superconductivity of Y2C 3 is that of an isotropic s-wave. From the fitting below T c, we estimated 2Δ/kBTc to be 3.6, 3.9, and 4.1 for the 11, 13, and 15 K samples, respectively. We found that T c of Y2C3 was correlated to the Sommerfeld coefficient, and that the high-Tc material was in a stronger coupling regime than the low-Tc material.

Original languageEnglish
Article number024713
Journaljournal of the physical society of japan
Volume76
Issue number2
DOIs
Publication statusPublished - Feb 1 2007
Externally publishedYes

Keywords

  • Lanthanoid carbide
  • Specific heat
  • Superconductivity
  • Susceptibility
  • Y C

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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