journal article·2019-04-01Open access

Measurements of the superconducting anisotropy in FeSe with a resonance frequency technique

R. X. Cao, Jun Dong, Q. L. Wang, Y. J. Yang, C. Zhao, X. H. Zeng, D. A. Chareev, A. N. Vasiliev, Bing Wu, Guoqing Wu

AIP Advances· Volume 9· Issue 4

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 α 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 Γ(0) were observed in FeSe.
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Research context

OpenAlex topics: Iron-based superconductors research · Physics of Superconductivity and Magnetism · Rare-earth and actinide compounds

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Physics Science and Technology, Yangzhou University 1 , Yangzhou, Jiangsu 225002, China

Institute of Electrical Engineering, Chinese Academy of Sciences 2 , Beijing 100190, China

Institute of Experimental Mineralogy, Russian Academy of Sciences 3 , 142432 Chernogolovka, Moscow District, Russia

Institute of Physics and Technology, Ural Federal University 4 , Mira St. 19, Ekaterinburg 620002, Russia

Kazan Federal University 5 , 18 Kremlyovskaya Str., Kazan 420008, Russia

Low Temperature Physics and Superconductivity Department, Lomonosov Moscow State University 6 , Moscow 119991, Russia

National University of Science and Technology “MISiS” 7 , Moscow 119049, Russia

National Research South Ural State University 8 , Chelyabinsk 454080, Russia

Department of Math and Computer Science, Fayetteville State University 9 , Fayetteville, North Carolina 28301, USA

Funding

Act 211 of Russian Federation · Program 211 of the Russian Federation Government · Russian Federation in the framework of Increase CompetitiveCompetitiveness Program of NUST MISiS · Russian Foundation for Basic Research · Russian Government Program of Competitive Growth of Kazan Federal University · National Natural Science Foundation of China · Natural Science Foundation of Jiangsu Province

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