Cite this Article
Ni Shunli, Hu Wei, Shen Peipei, Wei Zhongxu, Liu Shaobo, Li Dong, Yuan Jie, Yu Li, Jin Kui, Zhou Fang, Dong Xiaoli, Zhao Zhongxian. Different behavior of upper critical field in Fe1−xSe single crystals. Chinese Physics B, 2019, 28(12): 127401  
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Different behavior of upper critical field in Fe1−xSe single crystals
Ni Shunli1, 2, Hu Wei1, 2, Shen Peipei1, 2, Wei Zhongxu1, 2, Liu Shaobo1, 2, Li Dong1, 2, Yuan Jie1, 3, Yu Li1, 2, 4, Jin Kui1, 2, 3, 4, Zhou Fang1, 2, †, Dong Xiaoli1, 2, 3, 4, Zhao Zhongxian1, 2, 3, 4
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Key Laboratory for Vacuum Physics, University of Chinese Academy of Sciences, Beijing 100049, China
Songshan Lake Materials Laboratory, Dongguan 523808, China

 

† Corresponding author. E-mail: fzhou@iphy.ac.cn

Project supported by the National Natural Science Foundation of China (Grant Nos. 11888101 and 11834016), the National Key Research and Development Program of China (Grant Nos. 2017YFA0303003 and 2016YFA0300300), and the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant Nos. QYZDY-SSW-SLH001 and XDB25000000).

Abstract

The temperature dependences of upper critical field (Hc2) for a series of iron-deficient Fe1−xSe single crystals are obtained from the measurements of in-plane resistivity in magnetic fields up to 9 T and perpendicular to the ab plane. For the samples with lower superconducting transition temperature Tc (<7.2 K), the temperature dependence of Hc2 is appropriately described by an effective two-band model. For the samples with higher Tc (≳ 7.2 K), the temperature dependence can also be fitted by a single-band Werthamer–Helfand–Hohenberg formula, besides the two-band model. Such a Tc-dependent change in Hc2(T) behavior is discussed in connection with recent related experimental results, showing an inherent link between the changes of intrinsic superconducting and normal state properties in the FeSe system.

PACS: 74.70.Xa;74.25.Op;74.62.-c;74.25.F-
Keyword:iron-deficient Fe1-xSe superconductors;upper critical field;magnetoresistivity
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