Tunnel diode oscillator measurements of the upper critical magnetic field of FeTe0:5Se0:5

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 th...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014, Vol.26 (18)
Main Authors: Audouard, Alain, Drigo, Loïc, Duc, Fabienne, Fabrèges, Xavier, Bosseaux, Ludovic, Toulemonde, Pierre
Format: Article
Language:English
Subjects:
Condensed Matter
Physics
Superconductivity
Online Access:Get full text
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Summary: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.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/26/18/185701