1. Effect of impurity scattering on superconductivity in K$_2$Cr$_3$As$_3$
- Author
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Liu, Y., Bao, J. K., Zuo, H. K., Ablimit, A., Tang, Z. T., Feng, C. M., Zhu, Z. W., and Cao, G. H.
- Subjects
Condensed Matter - Superconductivity - Abstract
Impurity scattering in a superconductor may serve as an important probe for the nature of superconducting pairing state. Here we report the impurity effect on superconducting transition temperature $T_\mathrm{c}$ in the newly discovered Cr-based superconductor K$_2$Cr$_3$As$_3$. The resistivity measurements show that the crystals prepared using high-purity Cr metal ($\geq$99.99\%) have an electron mean free path much larger than the superconducting coherence length. For the crystals prepared using impure Cr that contains various \emph{nonmagnetic} impurities, however, the $T_\mathrm{c}$ decreases significantly, in accordance with the generalized Abrikosov-Gor'kov pair-breaking theory. This finding supports a non-$s$-wave superconductivity in K$_2$Cr$_3$As$_3$., Comment: 5 pages, 3 figures, accepted for publication in SCIENCE CHINA Physics, Mechanics & Astronomy
- Published
- 2016
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