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Pauli-limited upper critical field in Fe1+yTe1-xSex

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arxiv 1001.1751 v3 pith:6J5H6J7G submitted 2010-01-11 cond-mat.supr-con cond-mat.str-el

Pauli-limited upper critical field in Fe1+yTe1-xSex

classification cond-mat.supr-con cond-mat.str-el
keywords u0hc2fieldtemperaturecriticalcrystalsdirectionsupperab-plane
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this work we investigated the temperature dependence of the upper critical field u0Hc2(T) of Fe1.02(3)Te0.61(4)Se0.39(4) and Fe1.05(3)Te0.89(2)Se0.11(2) single crystals by measuring the magnetotransport properties in stable dc magnetic fields up to 35 T. Both crystals show that u0Hc2(T) in the ab-plane and along the c-axis exhibit saturation at low temperatures. The anisotropy of u0Hc2(T) decreases with decreasing temperature, becoming nearly isotropic when the temperature T->0. Furthermore, u0Hc2(0) deviates from the conventional Werthamer-Helfand-Hohenberg (WHH) theoretical prediction values for both field directions. Our analysis indicates that the spin-paramagnetic pair-breaking effect is responsible for the temperature-dependent behavior of u0Hc2(T) in both field directions.

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