Ca3Ir4Sn13: A weakly correlated nodeless superconductor
| Autor: | Kefeng Wang, C. Petrovic |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Electrical resistivity and conductivity Condensed Matter::Superconductivity Seebeck coefficient Fermi energy Fermi surface Atmospheric temperature range Condensed Matter Physics Charge density wave Electronic Optical and Magnetic Materials Magnetic field |
| Zdroj: | Physical Review B. 86 |
| ISSN: | 1550-235X 1098-0121 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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