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Title: Absence of Y-pocket in 1-Fe Brillouin zone and reversed orbital occupation imbalance in FeSe

Abstract

The FeSe nematic phase has been the focus of recent research on iron-based superconductors (IBSs) due to its unusual properties, which are distinct from those of the pnictides. A series of theoretical/experimental studies were performed to determine the origin of the nematic phase. However, they yielded conflicting results and caused additional controversies. Here, we report the results of angle-resolved photoemission and X-ray absorption spectroscopy studies on FeSe detwinned by a piezo stack. We fully resolved band dispersions with orbital characters near the Brillouin zone (BZ) corner, and revealed an absence of any Fermi pocket at the Y point in the 1-Fe BZ. In addition, the occupation imbalance between dxz and dyz orbitals was the opposite of that of iron pnictides, consistent with the identified band characters. These results resolve issues associated with the FeSe nematic phase and shed light on the origin of the nematic phase in IBSs.

Authors:
ORCiD logo [1];  [2];  [1];  [3];  [1];  [4];  [5]; ORCiD logo [5];  [6];  [7];  [8];  [6];  [6];  [6];  [4];  [1]
  1. Inst. for Basic Science (IBS), Seoul (South Korea); Seoul National Univ. (SNU) (South Korea)
  2. Yonsei Univ., Seoul (South Korea)
  3. Inst. for Basic Science (IBS), Seoul (South Korea); Seoul National Univ. (SNU) (South Korea); Chinese Academy of Sciences (CAS), Shanghai (China)
  4. Korea Advanced Inst. of Science and Technology (KAIST), Daejeon (South Korea)
  5. Inst. for Basic Science (IBS), Pohang (South Korea); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  6. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  7. Inst. for Basic Science (IBS), Seoul (South Korea); Seoul National Univ. (SNU) (South Korea); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Institute for Basic Science in Korea
OSTI Identifier:
1631680
Grant/Contract Number:  
AC02-05CH11231; IBS-R0009-G2
Resource Type:
Accepted Manuscript
Journal Name:
Communications Physics
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2399-3650
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and materials; superconducting properties and materials

Citation Formats

Huh, S. S., Seo, J. J., Kim, B. S., Cho, S. H., Jung, J. K., Kim, S., Kwon, C. I., Kim, Jun Sung, Koh, Y. Y., Kyung, W. S., Denlinger, J. D., Kim, Y. H., Chae, B. N., Kim, N. D., Kim, Y. K., and Kim, C.. Absence of Y-pocket in 1-Fe Brillouin zone and reversed orbital occupation imbalance in FeSe. United States: N. p., 2020. Web. https://doi.org/10.1038/s42005-020-0319-1.
Huh, S. S., Seo, J. J., Kim, B. S., Cho, S. H., Jung, J. K., Kim, S., Kwon, C. I., Kim, Jun Sung, Koh, Y. Y., Kyung, W. S., Denlinger, J. D., Kim, Y. H., Chae, B. N., Kim, N. D., Kim, Y. K., & Kim, C.. Absence of Y-pocket in 1-Fe Brillouin zone and reversed orbital occupation imbalance in FeSe. United States. https://doi.org/10.1038/s42005-020-0319-1
Huh, S. S., Seo, J. J., Kim, B. S., Cho, S. H., Jung, J. K., Kim, S., Kwon, C. I., Kim, Jun Sung, Koh, Y. Y., Kyung, W. S., Denlinger, J. D., Kim, Y. H., Chae, B. N., Kim, N. D., Kim, Y. K., and Kim, C.. Fri . "Absence of Y-pocket in 1-Fe Brillouin zone and reversed orbital occupation imbalance in FeSe". United States. https://doi.org/10.1038/s42005-020-0319-1. https://www.osti.gov/servlets/purl/1631680.
@article{osti_1631680,
title = {Absence of Y-pocket in 1-Fe Brillouin zone and reversed orbital occupation imbalance in FeSe},
author = {Huh, S. S. and Seo, J. J. and Kim, B. S. and Cho, S. H. and Jung, J. K. and Kim, S. and Kwon, C. I. and Kim, Jun Sung and Koh, Y. Y. and Kyung, W. S. and Denlinger, J. D. and Kim, Y. H. and Chae, B. N. and Kim, N. D. and Kim, Y. K. and Kim, C.},
abstractNote = {The FeSe nematic phase has been the focus of recent research on iron-based superconductors (IBSs) due to its unusual properties, which are distinct from those of the pnictides. A series of theoretical/experimental studies were performed to determine the origin of the nematic phase. However, they yielded conflicting results and caused additional controversies. Here, we report the results of angle-resolved photoemission and X-ray absorption spectroscopy studies on FeSe detwinned by a piezo stack. We fully resolved band dispersions with orbital characters near the Brillouin zone (BZ) corner, and revealed an absence of any Fermi pocket at the Y point in the 1-Fe BZ. In addition, the occupation imbalance between dxz and dyz orbitals was the opposite of that of iron pnictides, consistent with the identified band characters. These results resolve issues associated with the FeSe nematic phase and shed light on the origin of the nematic phase in IBSs.},
doi = {10.1038/s42005-020-0319-1},
journal = {Communications Physics},
number = 1,
volume = 3,
place = {United States},
year = {2020},
month = {3}
}

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