TY - JOUR
T1 - Superconducting state in the ternary stannide superconductors R 3T4Sn13 (R = La, Sr; T = Rh, Ir) with a quasiskutterudite structure
AU - Kase, N.
AU - Hayamizu, H.
AU - Akimitsu, J.
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/5/17
Y1 - 2011/5/17
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.83.184509
DO - 10.1103/PhysRevB.83.184509
M3 - Article
AN - SCOPUS:79961154068
VL - 83
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 18
M1 - 184509
ER -