期刊
PHYSICAL REVIEW B
卷 83, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.184509
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资金
- Ministry of Education, Culture, Sports, Science, and Technology, Japan
- Iwanami Fujukai Foundation
- Grants-in-Aid for Scientific Research [22245023] Funding Source: KAKEN
Single crystals of R3T4Sn13 (R = La, Sr; T = Rh, Ir) are synthesized by a Sn-flux method. Superconducting transition temperatures T-c are determined on the basis of magnetic susceptibility and electrical resistivity measurements. For La3T4Sn13, 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 Delta C-e/gamma T-c and 2 Delta(0)/k(B)T(c). 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 R3T4Sn13 (R = La, Sr; T = Rh, Ir) in Table I.
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