Superconducting state in the ternary stannide superconductors R 3T4Sn13 (R = La, Sr; T = Rh, Ir) with a quasiskutterudite structure

N. Kase, H. Hayamizu, J. Akimitsu

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45 Citations (Scopus)

Abstract

Single crystals of R3T4Sn13 (R = La, Sr; T = Rh, Ir) are synthesized by a Sn-flux method. Superconducting transition temperatures Tc are determined on the basis of magnetic susceptibility and electrical resistivity measurements. For La3T 4Sn13, Tc = 3.1 and 2.5 K when T = Rh and Ir, respectively; similarly, for Sr3T4Sn13, T c = 4.2 and 5.0 K. Specific heat measurements indicate that superconducting gaps of these compounds are isotropic and that these superconductors can be categorized as strong-coupling superconductors on the basis of the values of ΔCe/γTc and 2Δ(0)/kBTc. The upper critical field shows a clear enhancement with respect to the Werthamer-Helfand-Hohenberg prediction; this enhancement is consistent with the presence of a strong electron-phonon coupling. We summarized the normal and superconducting parameters of R 3T4Sn13 (R = La, Sr; T = Rh, Ir) in Table.

Original languageEnglish
Article number184509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number18
DOIs
Publication statusPublished - May 17 2011
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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