隧道二极管振荡器测量FeTe0：5Se 0：5的上临界磁场
Tunnel diode oscillator measurements of the upper critical magnetic field of FeTe0:5Se0:5
摘要：
在磁场高达55 T、温度低至1.6 K的条件下，用隧道二极管双极型超导体测量了FeTe_（0.5）Se_（0.5）（Tc = 14.5 K）的上临界磁场（Hc_2）随温度的变化关系。Werthamer-Helfand-Hohenberg模型解释了平行（H）和平行（H）施加的磁场的数据||ab）和垂直（H|| c）到铁导电平面，符合单带超导性。而对于H，泡利对破缺可以忽略不计，||c，证明了H的泡利贡献||ab，Maki参数α = 1.4，对应于Pauli场HP = 79 T。结果，在Tc（γ = 1.6）下已经相当小的Hc 2各向异性（= Habc 2/Hcc 2）随着温度降低而进一步减小，并且在液氦温度下变得小于1。
英文摘要：
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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