Two distinct superconducting states controlled by orientations of local wrinkles in LiFeAs
Autor: | Jiangping Hu, Geng Li, Hong-Jun Gao, Li Huang, Qi Zheng, Changqing Jin, Lu Cao, Xiancheng Wang, Hong Ding, Xiao Lin, Guangyang Dai, Shiyu Zhu, Wu Zhou, Yuxin Wang, Fazhi Yang, Wenyao Liu, Kun Jiang, Lingyuan Kong |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Phase transition
Materials science Electronic properties and materials Science FOS: Physical sciences General Physics and Astronomy General Biochemistry Genetics and Molecular Biology Article law.invention Superconducting properties and materials Superconductivity (cond-mat.supr-con) Physics::Fluid Dynamics Condensed Matter - Strongly Correlated Electrons Surfaces interfaces and thin films law Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Spectroscopy Nonlinear Sciences::Pattern Formation and Solitons Phase diagram Superconductivity Multidisciplinary Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Transition temperature Condensed Matter - Superconductivity General Chemistry Symmetry (physics) Vortex Nonlinear Sciences::Chaotic Dynamics Condensed Matter::Soft Condensed Matter Scanning tunneling microscope |
Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-7 (2021) Nature Communications Web of Science |
ISSN: | 2041-1723 |
Popis: | For iron-based superconductors, the phase diagrams under pressure or strain exhibit emergent phenomena between unconventional superconductivity and other electronic orders, varying in different systems. As a stoichiometric superconductor, LiFeAs has no structure phase transitions or entangled electronic states, which manifests an ideal platform to explore the pressure or strain effect on unconventional superconductivity. Here, we observe two types of superconducting states controlled by orientations of local wrinkles on the surface of LiFeAs. Using scanning tunneling microscopy/spectroscopy, we find type-I wrinkles enlarge the superconducting gaps and enhance the transition temperature, whereas type-II wrinkles significantly suppress the superconducting gaps. The vortices on wrinkles show a C2 symmetry, indicating the strain effects on the wrinkles. By statistics, we find that the two types of wrinkles are categorized by their orientations. Our results demonstrate that the local strain effect with different directions can tune the superconducting order parameter of LiFeAs very differently, suggesting that the band shifting induced by directional pressure may play an important role in iron-based superconductivity. The evolution of superconductivity in LiFeAs with respect to pressure or strain remains elusive. Here, the authors observe different response of superconducting states due to different orientations of local wrinkles on the surface of LiFeAs. |
Databáze: | OpenAIRE |
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