Quantum criticality and nodal superconductivity in the FeAs-based superconductor KFe2As2 - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: The in-plane resistivity $ ho$ and thermal conductivity $\kappa$ ofFeAs-based superconductor KFe$ 2$As$ 2$ single crystal were measured down to 50mK. We observe non-Fermi-liquid behavior $ hoT \sim T^{1.5}$ at $H {c 2}$ =5 T, and the development of a Fermi liquid state with $ hoT \sim T^2$ whenfurther increasing field. This suggests a field-induced quantum critical point,occurring at the superconducting upper critical field $H {c 2}$. In zero fieldthere is a large residual linear term $\kappa 0-T$, and the field dependence of$\kappa 0-T$ mimics that in d-wave cuprate superconductors. This indicates thatthe superconducting gaps in KFe$ 2$As$ 2$ have nodes, likely d-wave symmetry.Such a nodal superconductivity is attributed to the antiferromagnetic spinfluctuations near the quantum critical point.



Autor: J. K. Dong, S. Y. Zhou, T. Y. Guan, H. Zhang, Y. F. Dai, X. Qiu, X. F. Wang, Y. He, X. H. Chen, S. Y. Li

Fuente: https://arxiv.org/



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