Effect of Co Impurities on Superconductivity of FeSe0.4Te0.6 single crystals
Fuyuki Nabeshima, Yusuke Kobayashi, Yoshinori Imai, Ichiro Tsukada,, and Atsutaka Maeda
TL;DR
This study investigates how cobalt impurities affect the superconducting properties of FeSe0.4Te0.6 single crystals, revealing a linear decrease in transition temperature and insights into the pairing mechanism.
Contribution
It provides experimental evidence on the impact of Co doping on FeSeTe superconductors and supports the sign-changing interband scattering mechanism.
Findings
Superconducting transition temperature decreases linearly with Co doping
Residual resistivity increases modestly with Co doping
Results support the s± pairing symmetry hypothesis
Abstract
The effect of Co doping on supercoductivity of FeSeTe single crystals is investigated. The superconducting transition temperature decreases linearly for Co doping with the rate -0.75 K/(Co %). On the other hand, the residual resistivity increase is less than 50 cm for 4 % Co doping. These data are consistent with the sign changing interband scattering mechanism of superconductivity ( symmetry).
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