Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin films
Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin films
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DOI：
10.1088/1367-2630/aade66
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发表时间：
2018-09
影响因子：
3.3
通讯作者：
F. Yuan;V. Grinenko;K. Iida;S. Richter;A. Pukenas;W. Skrotzki;M. Sakoda;M. Naito;A. Sala;M. Putti;A. Yamashita;Y. Takano;Zhixiang Shi;K. Nielsch;R. Hühne
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文献类型：
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作者：
F. Yuan;V. Grinenko;K. Iida;S. Richter;A. Pukenas;W. Skrotzki;M. Sakoda;M. Naito;A. Sala;M. Putti;A. Yamashita;Y. Takano;Zhixiang Shi;K. Nielsch;R. Hühne
揭示铁基超导体（FBS）的普遍行为对阐明超导的微观理论具有重要意义。在这项工作中，我们研究了FeSe 0.7Te 0.3薄膜在超导转变温度Tc处的上临界场Hc 2的斜率（即-dHc 2/dT）的面内应变的影响。面内应变在很宽的范围内调谐Tc，而组分和无序度几乎不变。我们发现− dHc 2/dT与Tc呈线性关系，表明FeSe0.7Te0.3遵循与磷属元素化物FBS相同的普遍行为。所观察到的行为与带间相互作用配对的多带超导性（如符号变化s±超导性）一致。
Revealing the universal behaviors of iron-based superconductors (FBS) is important to elucidate the microscopic theory of superconductivity. In this work, we investigate the effect of in-plane strain on the slope of the upper critical field Hc2 at the superconducting transition temperature Tc (i.e. −dHc2/dT) for FeSe0.7Te0.3 thin films. The in-plane strain tunes Tc in a broad range, while the composition and disorder are almost unchanged. We show that −dHc2/dT scales linearly with Tc, indicating that FeSe0.7Te0.3 follows the same universal behavior as observed for pnictide FBS. The observed behavior is consistent with a multiband superconductivity paired by interband interaction such as sign change s± superconductivity.