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Title: Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film

Abstract

© 2016 American Physical Society. The nematic state, where a system is translationally invariant but breaks rotational symmetry, has drawn great attention recently due to the experimental observations of such a state in both cuprates and iron-based superconductors. The origin of nematicity and its possible tie to the pairing mechanism of high-Tc, however, still remain controversial. Here, we study the electronic structure of a multilayer FeSe film using angle-resolved photoemission spectroscopy. The band reconstruction in the nematic state is clearly delineated. We find that the energy splitting between dxz and dyz bands shows a nonmonotonic distribution in momentum space. From the Brillouin zone center to the Brillouin zone corner, the magnitude of splitting first decreases, then increases, and finally reaches the maximum value of ~70 meV. Moreover, besides the dxz and dyz bands, band splitting was also observed on the dxy bands with a comparable energy scale around 45 meV. Our results suggest that the electronic anisotropy in the nematic state cannot be explained by a simple on-site ferro-orbital order. Instead, strong anisotropy exists in the hopping of all dxz,dyz, and dxy orbitals, the origin of which holds the key to a microscopic understanding of the nematicity in iron-based superconductors.

Authors:
 [1];  [2];  [2];  [3];  [2];  [3];  [4];  [5];  [5];  [6];  [6];  [2];  [2];  [4]
+ Show Author Affiliations
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Stanford Univ., CA (United States). Dept. of Physics and Dept. of Applied Physics
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
  5. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan); Japan Science and Technology Agency (JST), Tokyo (Japan)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1377500
Alternate Identifier(s):
OSTI ID: 1326699; OSTI ID: 1393078
Grant/Contract Number:  
AC02-05CH11231; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 11; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhang, Y., Yi, M., Liu, Z. -K., Li, W., Lee, J. J., Moore, R. G., Hashimoto, M., Nakajima, M., Eisaki, H., Mo, S. -K., Hussain, Z., Devereaux, T. P., Shen, Z. -X., and Lu, D. H. Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.115153.
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Zhang, Y., Yi, M., Liu, Z. -K., Li, W., Lee, J. J., Moore, R. G., Hashimoto, M., Nakajima, M., Eisaki, H., Mo, S. -K., Hussain, Z., Devereaux, T. P., Shen, Z. -X., & Lu, D. H. Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film. United States. https://doi.org/10.1103/PhysRevB.94.115153
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Zhang, Y., Yi, M., Liu, Z. -K., Li, W., Lee, J. J., Moore, R. G., Hashimoto, M., Nakajima, M., Eisaki, H., Mo, S. -K., Hussain, Z., Devereaux, T. P., Shen, Z. -X., and Lu, D. H. Mon . "Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film". United States. https://doi.org/10.1103/PhysRevB.94.115153. https://www.osti.gov/servlets/purl/1377500.
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@article{osti_1377500,
title = {Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film},
author = {Zhang, Y. and Yi, M. and Liu, Z. -K. and Li, W. and Lee, J. J. and Moore, R. G. and Hashimoto, M. and Nakajima, M. and Eisaki, H. and Mo, S. -K. and Hussain, Z. and Devereaux, T. P. and Shen, Z. -X. and Lu, D. H.},
abstractNote = {© 2016 American Physical Society. The nematic state, where a system is translationally invariant but breaks rotational symmetry, has drawn great attention recently due to the experimental observations of such a state in both cuprates and iron-based superconductors. The origin of nematicity and its possible tie to the pairing mechanism of high-Tc, however, still remain controversial. Here, we study the electronic structure of a multilayer FeSe film using angle-resolved photoemission spectroscopy. The band reconstruction in the nematic state is clearly delineated. We find that the energy splitting between dxz and dyz bands shows a nonmonotonic distribution in momentum space. From the Brillouin zone center to the Brillouin zone corner, the magnitude of splitting first decreases, then increases, and finally reaches the maximum value of ~70 meV. Moreover, besides the dxz and dyz bands, band splitting was also observed on the dxy bands with a comparable energy scale around 45 meV. Our results suggest that the electronic anisotropy in the nematic state cannot be explained by a simple on-site ferro-orbital order. Instead, strong anisotropy exists in the hopping of all dxz,dyz, and dxy orbitals, the origin of which holds the key to a microscopic understanding of the nematicity in iron-based superconductors.},
doi = {10.1103/PhysRevB.94.115153},
journal = {Physical Review B},
number = 11,
volume = 94,
place = {United States},
year = {Mon Sep 26 00:00:00 EDT 2016},
month = {Mon Sep 26 00:00:00 EDT 2016}
}
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https://doi.org/10.1103/PhysRevB.94.115153
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    Works referencing / citing this record:

    Stripes developed at the strong limit of nematicity in FeSe film
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    Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition
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    Absence of Y-pocket in 1-Fe Brillouin zone and reversed orbital occupation imbalance in FeSe
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    Abrupt change of the superconducting gap structure at the nematic critical point in FeSe 1−x S x
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    Antiferromagnetic Order in Epitaxial FeSe Films on SrTiO 3
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    Influence of Spin Orbit Coupling in the Iron-Based Superconductors
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    Theoretical study of impurity-induced magnetism in FeSe
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