Ca ${}_3$ Ir ${}_4$ Sn ${}_{13}$ : A weakly correlated nodeless superconductor

Journal Article · Sun Jul 01 00:00:00 EDT 2012 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.86.024522· OSTI ID:1056437

Wang, Kefeng; Petrovic, C.

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 T_c 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 T_c/T_F is very small. Our results indicate that Ca₃Ir₄Sn₁₃ is a weakly correlated nodeless superconductor.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: DE-AC02-98CH10886
• OSTI ID: 1056437
• Report Number(s): BNL-98528-2012-JA; PRBMDO; R&D Project: PO-013; KC0202010
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 86, Issue 2; ISSN 1098-0121
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
seebeck cofficient
Hall resistivity
Remeika phases