CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Interplay of Strain and Magnetism in FeSe Monolayers |
Yun Xie1,2, Junsheng Feng1,2, Hongjun Xiang1,2, Xingao Gong1,2** |
1Key Laboratory for Computational Physical Science (Ministry of Education), State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433 2Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093
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Cite this article: |
Yun Xie, Junsheng Feng, Hongjun Xiang et al 2019 Chin. Phys. Lett. 36 056801 |
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Abstract Superconductivity and its relationship with strain remains elusive in the monolayer FeSe superconductor. Based on first-principles calculations and model studies, we investigate the magnetic properties of FeSe and FeTe monolayers and find that tensile strain induces changes to magnetic phases for both materials. Furthermore, we reveal that electron doping will decrease the difference of effective magnetic interactions between the $a$ and $b$ directions in an FeSe monolayer and hence suppress its nematicity. We suggest that the overall effect of tensile strain combined with electron doping hinders the appearance of both magnetic and nematic orders in an FeSe monolayer, which paves the way for the emergence of superconductivity.
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Received: 12 March 2019
Published: 17 April 2019
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PACS: |
68.35.Gy
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(Mechanical properties; surface strains)
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74.70.Xa
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(Pnictides and chalcogenides)
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68.43.Bc
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(Ab initio calculations of adsorbate structure and reactions)
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Fund: Supported by the National Natural Science Foundation of China, the Special Funds for Major State Basic Research, the Qing Nian Ba Jian Program, and the Fok Ying Tung Education Foundation. |
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