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Title: Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors

Abstract

The momentum dependence of the nematic order parameter is a vital ingredient in the microscopic description of iron-based high-temperature superconductors. Although recent reports on FeSe imply that the nematic order parameter changes sign between electron and hole bands, detailed knowledge is still missing for other compounds. Combining angle-resolved photoemission spectroscopy with uniaxial strain tuning, we measure the nematic band splitting in both FeSe and BaFe 2As 2 without interference from either twinning or magnetic order. We find that the nematic order parameter exhibits the same momentum dependence in both compounds with a sign change between the Brillouin center and the corner. This indicates that the same microscopic mechanism drives the nematic order in spite of the very different phase diagrams.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [4];  [5];  [6];  [6];  [2];  [2];  [7];  [5];  [4];  [5]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Stanford Univ., CA (United States)
  3. Stanford Univ., CA (United States); Univ. of California, Berkeley, CA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  6. Rice Univ., Houston, TX (United States)
  7. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; German Science Foundation (DFG); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1558082
Alternate Identifier(s):
OSTI ID: 1547994
Grant/Contract Number:  
AC02-76SF00515; SC0012311; AC02-05-CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Pfau, H., Chen, S. D., Yi, M., Hashimoto, M., Rotundu, C. R., Palmstrom, J. C., Chen, T., Dai, P. -C., Straquadine, J., Hristov, A., Birgeneau, R. J., Fisher, I. R., Lu, D., and Shen, Z. -X. Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.066402.
Pfau, H., Chen, S. D., Yi, M., Hashimoto, M., Rotundu, C. R., Palmstrom, J. C., Chen, T., Dai, P. -C., Straquadine, J., Hristov, A., Birgeneau, R. J., Fisher, I. R., Lu, D., & Shen, Z. -X. Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors. United States. doi:10.1103/PhysRevLett.123.066402.
Pfau, H., Chen, S. D., Yi, M., Hashimoto, M., Rotundu, C. R., Palmstrom, J. C., Chen, T., Dai, P. -C., Straquadine, J., Hristov, A., Birgeneau, R. J., Fisher, I. R., Lu, D., and Shen, Z. -X. Wed . "Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors". United States. doi:10.1103/PhysRevLett.123.066402.
@article{osti_1558082,
title = {Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors},
author = {Pfau, H. and Chen, S. D. and Yi, M. and Hashimoto, M. and Rotundu, C. R. and Palmstrom, J. C. and Chen, T. and Dai, P. -C. and Straquadine, J. and Hristov, A. and Birgeneau, R. J. and Fisher, I. R. and Lu, D. and Shen, Z. -X.},
abstractNote = {The momentum dependence of the nematic order parameter is a vital ingredient in the microscopic description of iron-based high-temperature superconductors. Although recent reports on FeSe imply that the nematic order parameter changes sign between electron and hole bands, detailed knowledge is still missing for other compounds. Combining angle-resolved photoemission spectroscopy with uniaxial strain tuning, we measure the nematic band splitting in both FeSe and BaFe2As2 without interference from either twinning or magnetic order. We find that the nematic order parameter exhibits the same momentum dependence in both compounds with a sign change between the Brillouin center and the corner. This indicates that the same microscopic mechanism drives the nematic order in spite of the very different phase diagrams.},
doi = {10.1103/PhysRevLett.123.066402},
journal = {Physical Review Letters},
number = 6,
volume = 123,
place = {United States},
year = {2019},
month = {8}
}

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