Low temperature specific heat of superconducting ternary intermetallics La3Pd4Ge4, La3Ni4Si 4, and La3Ni4Ge4 with U 3Ni4Si4-type structure

S. Kasahara, H. Fujii, H. Takeya, T. Mochiku, A. D. Thakur, K. Hirata

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16 Citations (Scopus)

Abstract

A systematic investigation on the thermodynamic properties of La-based ternary intermetallic superconductors crystallizing in a U3Ni 4Si4-type structure is presented. The U3Ni 4Si4-type structure consists of a characteristic intergrowth of periodic BaAl4 (ThCr2Si2)- and AlB2-type segments. Pristine low temperature specific heat data for recently discovered members La3Ni4Si4 and La3Ni4Ge4 with Tcs of 1.0 and 0.7 K, respectively, are presented as well as La3Pd4Ge 4 with the highest Tc of 2.5 K in the U3Ni 4Si4-type group. Owing to the higher Tcs of U3Ni4Si4-type superconductors than the related ThCr2Si2-type compounds, comparisons are drawn in our investigations of the ternary intermetallics of LaPd2Ge2, LaNi2Si2, and LaNi2Ge2 having a ThCr2Si2-type structure. Our investigations of the thermodynamic properties show that La3Ni4Si4 and La3Ni4Ge4 have higher values of γn, N(EF), and ΘD than La 3Pd4Ge4. The same trend was found in ThCr 2Si2-type compounds of LaPd2Ge2, LaNi2Si2, and LaNi2Ge2. It turns out that the difference in Tc between La3Pd 4Ge4, La3Ni4Si4, and La3Ni4Ge4, as well as the relatively higher Tc of the U3Ni4Si4-type superconductors than of the related ThCr2Si2-type compounds, are largely due to the strength of electron-phonon coupling.

Original languageEnglish
Article number385204
JournalJournal of Physics Condensed Matter
Volume20
Issue number38
DOIs
Publication statusPublished - Sep 24 2008
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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