Revealing the A1g-type strain effect on superconductivity and nematicity in FeSe thin flake

doi:10.1088/1674-1056/ac1efa

中国物理B ›› 2021, Vol. 30 ›› Issue (9): 97403-097403.doi: 10.1088/1674-1056/ac1efa

Revealing the A_1g-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

收稿日期:2021-08-12 修回日期:2021-08-16 接受日期:2021-08-19 出版日期:2021-08-19 发布日期:2021-08-30
通讯作者: Tao Wu E-mail:wutao@ustc.edu.cn
基金资助:
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).

Revealing the A_1g-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

Received:2021-08-12 Revised:2021-08-16 Accepted:2021-08-19 Online:2021-08-19 Published:2021-08-30
Contact: Tao Wu E-mail:wutao@ustc.edu.cn
Supported by:
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).

1. 2021-097403-SI.pdf(1738KB)

摘要/Abstract

摘要： The driving mechanism of nematicity and its twist with superconductivity in iron-based superconductors are still under debate. Recently, a dominant B_1g-type strain effect on superconductivity is observed in underdoped iron-pnictides superconductors Ba(Fe_1-xCo_x)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 (T_c and T_s) in the FeSe thin flake. Our results reveal a predominant A_1g-type strain effect on T_c. Meanwhile, T_s exhibits a monotonic anti-correlation with T_c and the maximum T_c reaches to 12 K when T_s is strongly suppressed under the maximum compressive strain. Finally, in comparison with the results in the underdoped Ba(Fe_1-xCo_x)₂As₂, the absence of B_1g-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.

关键词: iron-based superconductors, superconductivity, electronic nematicity, strain effect

Abstract: The driving mechanism of nematicity and its twist with superconductivity in iron-based superconductors are still under debate. Recently, a dominant B_1g-type strain effect on superconductivity is observed in underdoped iron-pnictides superconductors Ba(Fe_1-xCo_x)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 (T_c and T_s) in the FeSe thin flake. Our results reveal a predominant A_1g-type strain effect on T_c. Meanwhile, T_s exhibits a monotonic anti-correlation with T_c and the maximum T_c reaches to 12 K when T_s is strongly suppressed under the maximum compressive strain. Finally, in comparison with the results in the underdoped Ba(Fe_1-xCo_x)₂As₂, the absence of B_1g-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.

Key words: iron-based superconductors, superconductivity, electronic nematicity, strain effect

中图分类号: (Pnictides and chalcogenides)

74.70.Xa

74.25.F- (Transport properties) 77.80.bn (Strain and interface effects)

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 A_1g-type strain effect on superconductivity and nematicity in FeSe thin flake[J]. 中国物理B, 2021, 30(9): 97403-097403.

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Revealing the A_1g-type strain effect on superconductivity and nematicity in FeSe thin flake

Revealing the A_1g-type strain effect on superconductivity and nematicity in FeSe thin flake

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