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
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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