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Title: Ca 3 Ir 4 Sn 13 : A weakly correlated nodeless superconductor

Abstract

We report detailed Seebeck coefficient, Hall resistivity, as well as specific heat measurement on Ca 3Ir 4Sn 13 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 Ca 3Ir 4Sn 13 is a weakly correlated nodeless superconductor.

Authors:
;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE SC OFFICE OF SCIENCE (SC)
OSTI Identifier:
1056437
Report Number(s):
BNL-98528-2012-JA
Journal ID: ISSN 1098-0121; PRBMDO; R&D Project: PO-013; KC0202010
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 86; Journal Issue: 2; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; seebeck cofficient; Hall resistivity; Remeika phases

Citation Formats

Wang, Kefeng, and Petrovic, C. Ca 3 Ir 4 Sn 13 : A weakly correlated nodeless superconductor. United States: N. p., 2012. Web. doi:10.1103/PhysRevB.86.024522.
Wang, Kefeng, & Petrovic, C. Ca 3 Ir 4 Sn 13 : A weakly correlated nodeless superconductor. United States. doi:10.1103/PhysRevB.86.024522.
Wang, Kefeng, and Petrovic, C. Sun . "Ca 3 Ir 4 Sn 13 : A weakly correlated nodeless superconductor". United States. doi:10.1103/PhysRevB.86.024522.
@article{osti_1056437,
title = {Ca 3 Ir 4 Sn 13 : A weakly correlated nodeless superconductor},
author = {Wang, Kefeng and Petrovic, C.},
abstractNote = {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 Tc/TF is very small. Our results indicate that Ca3Ir4Sn13 is a weakly correlated nodeless superconductor.},
doi = {10.1103/PhysRevB.86.024522},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 2,
volume = 86,
place = {United States},
year = {2012},
month = {7}
}