Low temperature specific heat of ternary germanide superconductor La3Pd4Ge4

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

doi:10.1016/j.physb.2007.10.347

Low temperature specific heat of ternary germanide superconductor La₃Pd₄Ge₄

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

Research output: Contribution to journal › Article › peer-review

3 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 γ_n = 27.0 mJ / mol K² and the Debye temperature Θ_D = 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 language	English
Pages (from-to)	1119-1121
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	403
Issue number	5-9
DOIs	https://doi.org/10.1016/j.physb.2007.10.347
Publication status	Published - Apr 1 2008
Externally published	Yes

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

Access to Document

10.1016/j.physb.2007.10.347

Cite this

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title = "Low temperature specific heat of ternary germanide superconductor La3Pd4Ge4",

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.",

keywords = "LaPdGe, Specific heat, ThCrSi derivative, UNiSi-type structure",

author = "Shigeru Kasahara and Hiroki Fujii and Takashi Mochiku and Hiroyuki Takeya and Kazuto Hirata",

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T1 - Low temperature specific heat of ternary germanide superconductor La3Pd4Ge4

AU - Kasahara, Shigeru

AU - Fujii, Hiroki

AU - Mochiku, Takashi

AU - Takeya, Hiroyuki

AU - Hirata, Kazuto

PY - 2008/4/1

Y1 - 2008/4/1

N2 - 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.

AB - 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.

KW - LaPdGe

KW - Specific heat

KW - ThCrSi derivative

KW - UNiSi-type structure

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