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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2014

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

Résumé

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.
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Dates et versions

hal-00955556 , version 1 (04-03-2014)

Identifiants

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Alain Audouard, Loïc Drigo, Fabienne Duc, Xavier Fabrèges, Ludovic Bosseaux, et al.. Tunnel diode oscillator measurements of the upper critical magnetic field of FeTe0:5Se0:5. Journal of Physics: Condensed Matter, 2014, 26 (18), pp.185701. ⟨10.1088/0953-8984/26/18/185701⟩. ⟨hal-00955556⟩
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