Measurements of the superconducting anisotropy in FeSe with a resonance frequency technique
Document Type
Article
Publication Date
4-1-2019
Abstract
Utilizing a novel method with the resonance frequency of a LC circuit, we measured the superconducting anisotropy of single crystals of an Fe-based superconductor FeSe with applied magnetic field up to 16 T. We found that the temperature dependence of the upper critical field Hc2(T) of FeSe coincides with the Werthamer-Helfand-Hohenberg (WHH) model when taking the Maki parameter ? into consideration, suggesting an important role played by spin-paramagnetic effect in suppressing the superconductivity. When temperature T ? 0, the values of Hc2,?c(0) and Hc2,?ab(0) derived from the WHH fitting are close to and fall within the range of the Pauli limit, for field H0 applied parallel to the c-axis and to the ab-plane, respectively. As compared with other typical iron-based high-Tc superconductors, lower values of Hc2(0) and higher superconducting anisotropy ?(0) were observed in FeSe.
Recommended Citation
Cao, R. X.; Dong, Jun; Wang, Q. L.; Yang, Y. J.; Zhao, C.; Zeng, X. H.; Chareev, D. A.; Vasiliev, A. N.; Wu, Bing; and Wu, Guoqing, "Measurements of the superconducting anisotropy in FeSe with a resonance frequency technique" (2019). College of Health, Science, and Technology. 1062.
https://digitalcommons.uncfsu.edu/college_health_science_technology/1062