Low temperature specific heat of ternary germanide superconductor La3Pd4Ge4

Shigeru Kasahara, Hiroki Fujii, Takashi Mochiku, Hiroyuki Takeya, Kazuto Hirata

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Low temperature specific heat measurements are performed in a novel ternary superconductor La3Pd4Ge4, which forms U3Ni4Si4-type crystal structure consisting of the combination of alternating units of AlB2- and BaAl4 (ThCr2Si2)-type layers. The Sommerfeld coefficient γn = 27.0 mJ / mol K2 and the Debye temperature ΘD = 256 K are derived from the normal state specific heat. The electron-phonon coupling constant and the electronic density of states at the Fermi level are also derived. Temperature dependence of the superconducting electronic specific heat is well described by the BCS exponential behavior with gap Δ0 = 0.30 meV. The results suggest La3Pd4Ge4 has fully opened isotropic gap in the superconducting state.

Original languageEnglish
Pages (from-to)1119-1121
Number of pages3
JournalPhysica B: Condensed Matter
Volume403
Issue number5-9
DOIs
Publication statusPublished - Apr 1 2008
Externally publishedYes

Keywords

  • LaPdGe
  • Specific heat
  • ThCrSi derivative
  • UNiSi-type structure

ASJC Scopus subject areas

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

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