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Momentum dependent dxz/yz band splitting in LaFeAsO

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Title
Momentum dependent dxz/yz band splitting in LaFeAsO
Author(s)
Soon Sang Huh; Youn Shin Kim; Won Shik Kyung; Jong Keun Jung; R. Kappenberger; S. Aswartham; B. Buchner; Jong Mok Ok; Jun Sung Kim; C. Dong; J.P. Hu; S.H. Cho; D.W. Shen; J.D. Denlinger; Y.K. Kim; Changyoung Kim
Subject
SUPERCONDUCTOR
Publication Date
2020-11-09
Journal
SCIENTIFIC REPORTS, v.10, no.1, pp.19377
Publisher
NATURE RESEARCH
Abstract
The nematic phase in iron based superconductors (IBSs) has attracted attention with a notion that it may provide important clue to the superconductivity. A series of angle-resolved photoemission spectroscopy (ARPES) studies were performed to understand the origin of the nematic phase. However, there is lack of ARPES study on LaFeAsO nematic phase. Here, we report the results of ARPES studies of the nematic phase in LaFeAsO. Degeneracy breaking between the dxz and dyz hole bands near the Gamma and M point is observed in the nematic phase. Different temperature dependent band splitting behaviors are observed at the Gamma and M points. The energy of the band splitting near the M point decreases as the temperature decreases while it has little temperature dependence near the Gamma point. The nematic nature of the band shift near the M point is confirmed through a detwin experiment using a piezo device. Since a momentum dependent splitting behavior has been observed in other iron based superconductors, our observation confirms that the behavior is a universal one among iron based superconductors.
URI
https://pr.ibs.re.kr/handle/8788114/7516
DOI
10.1038/s41598-020-75600-w
ISSN
2045-2322
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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