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Ok, Jong Mok
원자제어 저차원 전자계 연구단
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Band-selective gap opening by a C4-symmetric order in a proximity-coupled heterostructure Sr2VO3FeAs

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Title
Band-selective gap opening by a C4-symmetric order in a proximity-coupled heterostructure Sr2VO3FeAs
Author(s)
Kim, Sunghun; Jong Mok Ok; Oh, Hanbit; Chang Il Kwon; Zhang, Yi; Denlinger, Jonathan D.; Mo, Sung-Kwan; Wolff-Fabris, Frederik; Kampert, Erik; Moon, Eun-Gook; Changyoung Kim; Jun Sung Kim; Kim, Yeongkwan
Publication Date
2021-11-23
Journal
Proceedings of the National Academy of Sciences of the United States of America, v.118, no.47
Publisher
National Academy of Sciences
Abstract
© 2021 National Academy of Sciences. All rights reserved.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.
URI
https://pr.ibs.re.kr/handle/8788114/10906
DOI
10.1073/pnas.2105190118
ISSN
0027-8424
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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