Inversion of the upper critical field anisotropy in FeTeS films
Inversion of the upper critical field anisotropy in FeTeS films
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DOI：
10.1088/0953-2048/27/4/044005
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发表时间：
2014-03
影响因子：
3.6
通讯作者：
B. Maiorov;P. Mele;S. Baily;M. Weigand;S.-Z. Lin;F. Balakirev;K. Matsumoto;H. Nagayoshi;S. Fujita;Y. Yoshida;Y. Ichino;T. Kiss;A. Ichinose;M. Mukaida;L. Civale
中科院分区：
文献类型：
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作者：
B. Maiorov;P. Mele;S. Baily;M. Weigand;S.-Z. Lin;F. Balakirev;K. Matsumoto;H. Nagayoshi;S. Fujita;Y. Yoshida;Y. Ichino;T. Kiss;A. Ichinose;M. Mukaida;L. Civale
给出了在三个晶向(H∥c，45°和ab)测量的FeTES薄膜的完整超导上临界场(Hc2)-温度(T)图。我们发现，Hc2在磁场取向上几乎是各向同性的，μ为0Hc2(T=0)∼30T，转变温度为TC∼7K。T<；0.7TcHc2角各向异性很小但很明显，从Hc2(∥c)0.7TC到Hc2(∥c)>；Hc2(∥ab)。这种各向异性的变化类似于在FeTES和FeTeSe单晶中观察到的变化，但对于我们的薄膜来说，这种变化发生在更高的T/T。我们从对破裂机制和双带超导体理论的角度对HC2(T)进行了分析。对HC2反转的理解使我们有可能根据不同的应用来调整超导体的有效各向异性。
We present the complete superconducting upper critical field (Hc2)—temperature (T) diagram of FeTeS films measured at three crystalline orientations (H ∥ c, 45° and ab). We find that Hc2 is almost isotropic in magnetic field orientation with μ0Hc2(T = 0) ∼ 30 T and a transition temperature of Tc ∼ 7 K. A small but clear Hc2 angular anisotropy is observed, with a crossover around T = 0.7Tc, from Hc2(∥ c) 0.7Tc to Hc2(∥ c) > Hc2(∥ ab) for T < 0.7Tc. This change in the anisotropy is similar to that observed in FeTeS and FeTeSe single crystals but occurs at a higher T/Tc for our film. We analyze the Hc2(T) in terms of pair-breaking mechanisms and two-band superconductor theory. Understanding the inversion of Hc2 opens the possibility to adjust the effective anisotropy of superconductors for different applications.