Investigation of the superconducting gap structure in κ-(BEDT-TTF)2Cu(NCS)2 and κ-(BEDT-TTF)2Cu[N(CN)2]Br by means of thermal-conductivity measurements
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
We report temperature-dependent thermal-conductivity, κ, measurements on the layered quasi-two-dimensional organic superconductors κ-(BEDT-TTF)2Cu(NCS)2 and κ-(BEDT-TTF)2Cu[N(CN)2]Br down to 160 mK. The results for κ-(BEDT-TTF)2Cu(NCS)2 may be consistent with a nodal superconducting (SC) gap structure as indicated by a non-negligible remnant linear contribution when κ/T ∝ T2 is extrapolated to T = 0. For κ-(BEDT-TTF)2Cu[N(CN)2]Br, contrary to expectations, higher κ values are observed in the superconducting regime as compared to the normal, high-field state evidencing a dominant phonon contribution to κ in the superconducting state. The strong increase of κ in the normal state below T c for both samples indicates strong electron-phonon scattering. Our results highlight the need for thermal-conductivity measurements performed down to significantly lower temperatures to determine the symmetry of the SC gap.
Details
Originalsprache | Englisch |
---|---|
Aufsatznummer | 405604 |
Fachzeitschrift | Journal of Physics Condensed Matter |
Jahrgang | 29 |
Ausgabenummer | 40 |
Publikationsstatus | Veröffentlicht - 1 Sept. 2017 |
Peer-Review-Status | Ja |
Externe IDs
PubMed | 28748831 |
---|
Schlagworte
ASJC Scopus Sachgebiete
Schlagwörter
- organic superconductor, quasi-two dimensional, superconducting gap, thermal conductivity