title: Tunnel diode oscillator measurements of the upper critical magnetic field of FeTe(0.5)Se(0.5).
abstract: 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 α = 1.4, corresponding to Pauli field HP = 79 T. As a result, the Hc2 anisotropy [Formula: see text] which is already rather small at Tc (γ = 1.6) further decreases as the temperature decreases and becomes smaller than 1 at liquid helium temperatures.
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses (UPR 3228 CNRS, INSA, UJF, UPS) 143 avenue de Rangueil, F-31400 Toulouse, France.
authors.forename: A
authors.initials: A
authors.lastname: Audouard
authors.forename: L
authors.initials: L
authors.lastname: Drigo
authors.forename: F
authors.initials: F
authors.lastname: Duc
authors.forename: X
authors.initials: X
authors.lastname: Fabrèges
authors.forename: L
authors.initials: L
authors.lastname: Bosseaux
authors.forename: P
authors.initials: P
authors.lastname: Toulemonde
mesh_terms: D058085:Iron Compounds; D060526:Magnetic Fields; D012643:Selenium; D013691:Tellurium; D013696:Temperature
chemical_list: D058085:Iron Compounds; D012643:Selenium; D013691:Tellurium