Superconducting state in the ternary germanide Y2AlGe 3 with related ThCr2Si2-type structure

Naoki Kase, Hironaga Sasaki, Hiroki Hayamizu, Jun Akimitsu

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3 Citations (Scopus)

Abstract

Superconductivity in a ternary germanide, Y2AlGe3, was revealed at the transition temperature of 4.5 K by electrical resistivity and magnetic susceptibility measurements. The magnetization versus magnetic field (M-H) curve indicated that Y2AlGe3 was a type-II superconductor. The lower critical field Hc1 (0) and the upper critical field Hc2(0) were estimated to be 1.66(8) mT and 1.26(15) T. The coherence length ξ(0)GL, penetration depth λ(0) GL, and Ginzburg-Landau (GL) parameter κ(0) obtained from the critical fields were 16.2(5) nm, 631(16) nm, and 38(3), respectively. Specific heat measurements revealed that Y2AlGe3 was a weak-coupling BCS superconductor with an isotropic superconducting gap. The electron-phonon mass enhancement parameter λγ was calculated to be 0.13, which was in good agreement with the weak-coupling limit inferred from the specific heat ΔCe=γTc and 2Δ(0)=kBTc.

Original languageEnglish
Article number014716
Journaljournal of the physical society of japan
Volume80
Issue number1
DOIs
Publication statusPublished - Jan 1 2011
Externally publishedYes

Keywords

  • Band calculation
  • Specific heat
  • Superconductivity
  • YAlGe

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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