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 c in the newly discovered Cr-based superconductor K2Cr3As3. The resistivity measurements show that the crystals prepared using high-purity Cr metal (≥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 nonmagnetic impurities, however, the T c decreases significantly, in accordance with the generalized Abrikosov-Gor’kov pair-breaking theory. This finding supports a non-s-wave superconductivity in K2Cr3As3.
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Liu, Y., Bao, JK., Zuo, HK. et al. Effect of impurity scattering on superconductivity in K2Cr3As3 . Sci. China Phys. Mech. Astron. 59, 657402 (2016). https://doi.org/10.1007/s11433-016-5788-6
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DOI: https://doi.org/10.1007/s11433-016-5788-6