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Author
Sera, Yasuaki Department of Physics, Okayama University
Ueda, Takahiro Department of Physics, Okayama University
Adachi, Hiroto Department of Physics, Okayama University ORCID Kaken ID researchmap
Ichioka, Masanori Department of Physics, Okayama University ORCID Kaken ID publons researchmap
Abstract
Non-magnetic impurity scattering effects on the vortex core states are theoretically studied to clarify the contributions from the sign-change of the pairing function in anisotropic superconductors. The vortex states are calculated by the Eilenberger theory in superconductors with px-wave pairing symmetry, as well as the corresponding anisotropic s-wave symmetry. From the spatial structure of the pair potential and the local electronic states around a vortex, we examine the differences between anisotropic superconductors with and without sign-change of the pairing function, and estimate how twofold symmetric vortex core images change with increasing the impurity scattering rate both in the Born and the unitary limits. We found that twofold symmetric vortex core image of zero-energy local density of states changes the orientation of the twofold symmetry with increasing the scattering rate when the sign change occurs in the pairing function. Without the sign change, the vortex core shape reduces to circular one with approaching dirty cases. These results of the impurity effects are valuable for identifying the pairing symmetry by observation of the vortex core image by the STM observation.
Keywords
unconventional superconductivity
pairing symmetry
vortex states
non-magnetic impurity scattering
Published Date
2020-01-18
Publication Title
Symmetry
Volume
volume12
Issue
issue1
Publisher
MDPI
Start Page
175
ISSN
2073-8994
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
© 2020 by the authors.
File Version
publisher
DOI
Web of Science KeyUT
Related Url
isVersionOf https://doi.org/10.3390/sym12010175
License
http://creativecommons.org/licenses/by/4.0/
Funder Name
Japan Society for the Promotion of Science
助成番号
17K05542
19H00657