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Band-selective gap opening by a C4-symmetric order in a proximity-coupled heterostructure Sr2VO3FeAs
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Kim, Sunghun, Ok, Jong Mok, Oh, Hanbit, Kwon, Chang Il, Zhang, Yi, Denlinger, Jonathan D., Mo, Sung-Kwan, Wolff-Fabris, Frederik, Kampert, Erik, Moon, Eun-Gook, Kim, Changyoung, Kim, Jun Sung and Kim, Yeongkwan (2021) Band-selective gap opening by a C4-symmetric order in a proximity-coupled heterostructure Sr2VO3FeAs. Proceedings of the National Academy of Sciences of the United States of America, 118 (47). e2105190118. doi:10.1073/pnas.2105190118 ISSN 0027-8424.
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Official URL: http://dx.doi.org/10.1073/pnas.2105190118
Abstract
Complex electronic phases in strongly correlated electron systems are manifested by broken symmetries in the low-energy electronic states. Some mysterious phases, however, exhibit intriguing energy gap opening without an apparent signature of symmetry breaking (e.g., high-TC cuprates and heavy fermion superconductors). Here, we report an unconventional gap opening in a heterostructured, iron-based superconductor Sr2VO3FeAs across a phase transition at T0 ∼150 K. Using angle-resolved photoemission spectroscopy, we identify that a fully isotropic gap opens selectively on one of the Fermi surfaces with finite warping along the interlayer direction. This band selectivity is incompatible with conventional gap opening mechanisms associated with symmetry breaking. These findings, together with the unusual field-dependent magnetoresistance, suggest that the Kondo-type proximity coupling of itinerant Fe electrons to localized V spin plays a role in stabilizing the exotic phase, which may serve as a distinct precursor state for unconventional superconductivity.
Item Type: | Journal Article | |||||||||||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Electrons, Electron configuration , Heterostructures , Iron-based superconductors , Fermi surfaces | |||||||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Proceedings of the National Academy of Sciences of the United States of America | |||||||||||||||||||||||||||||||||||||||||||||
Publisher: | National Academy of Sciences | |||||||||||||||||||||||||||||||||||||||||||||
ISSN: | 0027-8424 | |||||||||||||||||||||||||||||||||||||||||||||
Official Date: | 23 November 2021 | |||||||||||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 118 | |||||||||||||||||||||||||||||||||||||||||||||
Number: | 47 | |||||||||||||||||||||||||||||||||||||||||||||
Article Number: | e2105190118 | |||||||||||||||||||||||||||||||||||||||||||||
DOI: | 10.1073/pnas.2105190118 | |||||||||||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 18 November 2021 | |||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 19 November 2021 | |||||||||||||||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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