Thermal conductivity of overdoped BaFe$ {1.73}$Co$ {0.27}$As$ 2$ single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions - Condensed Matter > SuperconductivityReportar como inadecuado




Thermal conductivity of overdoped BaFe$ {1.73}$Co$ {0.27}$As$ 2$ single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions - Condensed Matter > Superconductivity - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The in-plane thermal conductivity $\kappa$ of overdoped FeAs-basedsuperconductor BaFe$ {1.73}$Co$ {0.27}$As$ 2$ $T c$ = 8.1 K single crystalwas measured down to 80 mK. In zero field, the residual linear term$\kappa 0-T$ is negligible, suggesting a nodeless superconducting gap in the$ab$-plane. In magnetic field, $\kappa 0-T$ increases rapidly, very differentfrom that of conventional s-wave superconductors. This anomalous$\kappa 0-TH$ may reveal an exotic superconducting gap structure in overdopedBaFe$ {1.73}$Co$ {0.27}$As$ 2$: the vanishing hole $\beta$ pocket has a muchlarger gap than the electron $\gamma$ and $\delta$ pockets which contain mostof the carriers. Such an exotic gap structure is an evidence forsuperconducting state induced by interband interactions, in which the band withthe {\it smaller} density of states has a {\it larger} gap.



Autor: J. K. Dong, S. Y. Zhou, T. Y. Guan, X. Qiu, C. Zhang, P. Cheng, L. Fang, H. H. Wen, S. Y. Li

Fuente: https://arxiv.org/



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