Ca3Ir4Sn13: A weakly correlated nodeless superconductor

Kefeng Wang (王克锋); C. Petrovic

doi:10.1103/PhysRevB.86.024522

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Ca3Ir4Sn13: A weakly correlated nodeless superconductor

Kefeng Wang (王克锋), C. Petrovic

DOI 10.1103/PhysRevB.86.024522 · Physical Review B

T1

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Abstract

We report detailed Seebeck coefficient, Hall resistivity, as well as specific heat measurement on Ca3Ir4Sn13 single crystals. The Seebeck coefficient exhibits a peak corresponding to the anomaly in resistivity at T*, and the carrier density is suppressed significantly below T*. This indicates a significant Fermi surface reconstruction and the opening of the charge density wave gap at the superlattice transition. The magnetic field induced enhancement of the residual specific heat coefficient γ(H) exhibits a nearly linear dependence on magnetic field, indicating a nodeless gap. In the temperature range close to Tc the Seebeck coefficient can be described well by the diffusion model. The zero-temperature extrapolated thermoelectric power is very small, implying large normalized Fermi temperature. Consequently the ratio TcTF is very small. Our results indicate that Ca3Ir4Sn13 is a weakly correlated nodeless superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ca3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	unknown
Ca3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.5	Pressure not reported	onset
Ca3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	unknown
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown