Superconducting state in the ternary stannide superconductors R3T4Sn13 (R = La, Sr; T = Rh, Ir) with a quasiskutterudite structure

N. Kase; H. Hayamizu; J. Akimitsu

doi:10.1103/PhysRevB.83.184509

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Superconducting state in the ternary stannide superconductors R3T4Sn13 (R = La, Sr; T = Rh, Ir) with a quasiskutterudite structure

N. Kase, H. Hayamizu, J. Akimitsu

DOI 10.1103/PhysRevB.83.184509 · Physical Review B

T1

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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 La3T4Sn13, Tc = 3.1 and 2.5 K when T = Rh and Ir, respectively; similarly, for Sr3T4Sn13, Tc = 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 R3T4Sn13 (R = La, Sr; T = Rh, Ir) in Table I.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La3Rh4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.1	Pressure not reported	unknown
La3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.5	Pressure not reported	unknown
Sr3Rh4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.2	Pressure not reported	unknown
Sr3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5	Pressure not reported	unknown
La3Rh4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.1	Pressure not reported	midpoint
La3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.5	Pressure not reported	midpoint
Sr3Rh4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.15	Pressure not reported	midpoint
Sr3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.95	Pressure not reported	midpoint
Ca3Rh4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown
Yb3Rh4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown