Abstract
The temperature dependence of the upper critical field (Hc2) in a (Li1−xFex)OHFe1−ySe single crystal ( K) has been determined by means of magnetotransport measurements down to 1.4 K both for inter-plane (, ) and in-plane (, ) field directions in static magnetic fields up to 14 T and pulsed magnetic fields up to 70 T. exhibits a quasilinear increase with decreasing temperature below the superconducting transition and can be described well by an effective two-band model with unbalanced diffusivity, while shows a flattening below 35 K and follows the Werthamer–Helfand–Hohenberg (WHH) model incorporating orbital pair-breaking and spin-paramagnetic effects, yielding zero-temperature critical fields of T and T. The anisotropy of the upper critical fields, monotonically decreases with decreasing temperature from about 7 near Tc to 1.5 at 0 K. This reduced anisotropy, observed in most Fe-based superconductors, is caused by the Pauli limitation of .
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