Revealing the A1g-type strain effect on superconductivity and nematicity in FeSe thin flake
Zhaohui Cheng(程朝晖)1, Bin Lei(雷彬)1, Xigang Luo(罗习刚)1,2, Jianjun Ying(应剑俊)1,3, Zhenyu Wang(王震宇)1,3, Tao Wu(吴涛)1,2,3,5,†, and Xianhui Chen(陈仙辉)1,2,3,4,5
1 CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei 230026, China; 2 Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China; 3 CAS Center for Excellence in Superconducting Electronics(CENSE), Shanghai 200050, China; 4 CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China; 5 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Abstract The driving mechanism of nematicity and its twist with superconductivity in iron-based superconductors are still under debate. Recently, a dominant B1g-type strain effect on superconductivity is observed in underdoped iron-pnictides superconductors Ba(Fe1-xCox)2As2, suggesting a strong interplay between nematicity and superconductivity. Since the long-range spin order is absent in FeSe superconductor, whether a similar strain effect could be also observed or not is an interesting question. Here, by utilizing a flexible film as substrate, we successfully achieve a wide-range-strain tuning of FeSe thin flake, in which both the tensile and compressive strain could reach up to ～0.7%, and systematically study the strain effect on both superconducting and nematic transition (Tc and Ts) in the FeSe thin flake. Our results reveal a predominant A1g-type strain effect on Tc. Meanwhile, Ts exhibits a monotonic anti-correlation with Tc and the maximum Tc reaches to 12 K when Ts is strongly suppressed under the maximum compressive strain. Finally, in comparison with the results in the underdoped Ba(Fe1-xCox)2As2, the absence of B1g-type strain effect in FeSe further supports the role of stripe-type spin fluctuations on superconductivity. In addition, our work also supports that the orbital degree of freedom plays a key role to drive the nematic transition in FeSe.
Fund: Project supported by the National Key R&D Program of China (Grant Nos. 2017YFA0303000 and 2016YFA0300201), the National Natural Science Foundation of China (Grant No. 11888101), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000), and the Anhui Initiative in Quantum Information Technologies (Grant No. AHY160000).
Corresponding Authors:
Tao Wu
E-mail: wutao@ustc.edu.cn
Cite this article:
Zhaohui Cheng(程朝晖), Bin Lei(雷彬), Xigang Luo(罗习刚), Jianjun Ying(应剑俊), Zhenyu Wang(王震宇), Tao Wu(吴涛), and Xianhui Chen(陈仙辉) Revealing the A1g-type strain effect on superconductivity and nematicity in FeSe thin flake 2021 Chin. Phys. B 30 097403
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