2014/03/04 by Alain Audouard, Audouard, Alain, Loïc Drigo +12
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Iron-based superconductors research #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1403.0844
arxiv created 2014/03/04 · openalex publication_date 2014/03/04 · arxiv updated 2014/03/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Temperature dependence of the upper critical magnetic field (Hc2) of single crystalline FeTe0.5Se0.5 (Tc = 14.5 K) have been determined by tunnel diode oscillator-based measurements in magnetic fields of up to 55 T and temperatures down to 1.6 K. The Werthamer-Helfand-Hohenberg model accounts for the data for magnetic field applied both parallel (H || ab) and perpendicular (H || c) to the iron conducting plane, in line with a single band superconductivity. Whereas Pauli pair breaking is negligible for H || c, Pauli contribution is evidenced for H || ab with Maki parameter alpha= 1.4, corresponding to Pauli field HP = 79 T. As a result, the Hc2 anisotropy (= Habc2 /Hcc2) which is already rather small at Tc (gamma = 1.6) further decreases as the temperature decreases and becomes smaller than 1 at liquid helium temperatures.