Anisotropic spin fluctuations in detwinned FeSe
Abstract
Superconductivity in FeSe emerges from a nematic phase that breaks four-fold rotational symmetry in the iron plane. This phase may arise from orbital ordering, spin fluctuations or hidden magnetic quadrupolar order. Here we use inelastic neutron scattering on a mosaic of single crystals of FeSe, detwinned by mounting on a BaFe2As2 substrate to demonstrate that spin excitations are most intense at the antiferromagnetic wave vectors QAF = (±1, 0) at low energies E = 6–11meV in the normal state. This two-fold (C2) anisotropy is reduced at lower energies, 3–5 meV, indicating a gapped four-fold (C4) mode. In the superconducting state, however, the strong nematic anisotropy is again reflected in the spin resonance (E= 3.6 meV) at QAF with incommensurate scattering around 5–6 meV. Our results highlight the extreme electronic anisotropy of the nematic phase of FeSe and are consistent with a highly anisotropic superconducting gap driven by spin fluctuations.
- Authors:
-
[3];
[4];
[5];
[7];
[8];
[8];
[11];
[14]
- Rice Univ., Houston, TX (United States)
- Johns Hopkins Univ., Baltimore, MD (United States)
- Universität Leipzig, Leipzig (Germany)
- Beijing Normal Univ., Beijing (China)
- Forschungszentrum Julich (Germany)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Technische Univ. Munchen, Garching (Germany)
- STFC Rutherford-Appleton Lab., Didcot (United Kingdom)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Univ. of Copenhagen (Denmark)
- Univ. of Florida, Gainesville, FL (United States)
- Johns Hopkins Univ., Baltimore, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Rice Univ., Houston, TX (United States); Beijing Normal Univ., Beijing (China)
- Publication Date:
- Research Org.:
- Rice Univ., Houston, TX (United States); Univ. of Florida, Gainesville, FL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
- OSTI Identifier:
- 1514254
- Alternate Identifier(s):
- OSTI ID: 1559627
- Grant/Contract Number:
- SC0012311; FG02-05ER46236; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Materials
- Additional Journal Information:
- Journal Volume: 18; Journal Issue: 7; Journal ID: ISSN 1476-1122
- Publisher:
- Springer Nature - Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Chen, Tong, Chen, Youzhe, Kreisel, Andreas, Lu, Xingye, Schneidewind, Astrid, Qiu, Yiming, Park, J. T., Perring, Toby G., Stewart, J. Ross, Cao, Huibo, Zhang, Rui, Li, Yu, Rong, Yan, Wei, Yuan, Andersen, Brian M., Hirschfeld, P. J., Broholm, Collin, and Dai, Pengcheng. Anisotropic spin fluctuations in detwinned FeSe. United States: N. p., 2019.
Web. doi:10.1038/s41563-019-0369-5.
Chen, Tong, Chen, Youzhe, Kreisel, Andreas, Lu, Xingye, Schneidewind, Astrid, Qiu, Yiming, Park, J. T., Perring, Toby G., Stewart, J. Ross, Cao, Huibo, Zhang, Rui, Li, Yu, Rong, Yan, Wei, Yuan, Andersen, Brian M., Hirschfeld, P. J., Broholm, Collin, & Dai, Pengcheng. Anisotropic spin fluctuations in detwinned FeSe. United States. https://doi.org/10.1038/s41563-019-0369-5
Chen, Tong, Chen, Youzhe, Kreisel, Andreas, Lu, Xingye, Schneidewind, Astrid, Qiu, Yiming, Park, J. T., Perring, Toby G., Stewart, J. Ross, Cao, Huibo, Zhang, Rui, Li, Yu, Rong, Yan, Wei, Yuan, Andersen, Brian M., Hirschfeld, P. J., Broholm, Collin, and Dai, Pengcheng. Mon .
"Anisotropic spin fluctuations in detwinned FeSe". United States. https://doi.org/10.1038/s41563-019-0369-5. https://www.osti.gov/servlets/purl/1514254.
@article{osti_1514254,
title = {Anisotropic spin fluctuations in detwinned FeSe},
author = {Chen, Tong and Chen, Youzhe and Kreisel, Andreas and Lu, Xingye and Schneidewind, Astrid and Qiu, Yiming and Park, J. T. and Perring, Toby G. and Stewart, J. Ross and Cao, Huibo and Zhang, Rui and Li, Yu and Rong, Yan and Wei, Yuan and Andersen, Brian M. and Hirschfeld, P. J. and Broholm, Collin and Dai, Pengcheng},
abstractNote = {Superconductivity in FeSe emerges from a nematic phase that breaks four-fold rotational symmetry in the iron plane. This phase may arise from orbital ordering, spin fluctuations or hidden magnetic quadrupolar order. Here we use inelastic neutron scattering on a mosaic of single crystals of FeSe, detwinned by mounting on a BaFe2As2 substrate to demonstrate that spin excitations are most intense at the antiferromagnetic wave vectors QAF = (±1, 0) at low energies E = 6–11meV in the normal state. This two-fold (C2) anisotropy is reduced at lower energies, 3–5 meV, indicating a gapped four-fold (C4) mode. In the superconducting state, however, the strong nematic anisotropy is again reflected in the spin resonance (E= 3.6 meV) at QAF with incommensurate scattering around 5–6 meV. Our results highlight the extreme electronic anisotropy of the nematic phase of FeSe and are consistent with a highly anisotropic superconducting gap driven by spin fluctuations.},
doi = {10.1038/s41563-019-0369-5},
journal = {Nature Materials},
number = 7,
volume = 18,
place = {United States},
year = {Mon May 20 00:00:00 EDT 2019},
month = {Mon May 20 00:00:00 EDT 2019}
}
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