Quantitative characterization of short-range orthorhombic fluctuations in FeSe through pair distribution function analysis
Abstract
Neutron and x-ray total scattering measurements have been performed on powder samples of the iron chalcogenide superconductor FeSe. Using pair distribution function analysis of the total scattering data to investigate short-range atomic correlations, we establish the existence of an instantaneous, local orthorhombic structural distortion attributable to nematic fluctuations that persists well into the high-temperature tetragonal phase, at least up to 300 K and likely to significantly higher temperatures. This short-range orthorhombic distortion is correlated over a length scale of about 1 nm at 300 K and grows to several nm as the temperature is lowered toward the long-range structural transition temperature. In the low-temperature nematic state, the local instantaneous structure exhibits an enhanced orthorhombic distortion relative to the average structure with a typical relaxation length of 3 nm. Finally, the quantitative characterization of these orthorhombic fluctuations sheds light on nematicity in this canonical iron-based superconductor.
- Authors:
-
[1];
- Brigham Young Univ., Provo, UT (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Fudan Univ., Shanghai (China)
- Univ. of California, Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Shanghai Municipal Education Commission; National Natural Science Foundation of China (NSFC); MOST of China; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1603520
- Alternate Identifier(s):
- OSTI ID: 1546459
- Grant/Contract Number:
- AC02-05CH11231; 2017-01-07-00-07-E00018; 11874119; 2016YFA0300203; AC02-05-CH11231; SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 2; 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; crystal structure; superconductivity; iron-based superconductors; neutron pair-distribution function analysis; x-ray pair-distribution function analysis
Citation Formats
Frandsen, Benjamin A., Wang, Qisi, Wu, Shan, Zhao, Jun, and Birgeneau, Robert J. Quantitative characterization of short-range orthorhombic fluctuations in FeSe through pair distribution function analysis. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.100.020504.
Frandsen, Benjamin A., Wang, Qisi, Wu, Shan, Zhao, Jun, & Birgeneau, Robert J. Quantitative characterization of short-range orthorhombic fluctuations in FeSe through pair distribution function analysis. United States. https://doi.org/10.1103/PhysRevB.100.020504
Frandsen, Benjamin A., Wang, Qisi, Wu, Shan, Zhao, Jun, and Birgeneau, Robert J. Thu .
"Quantitative characterization of short-range orthorhombic fluctuations in FeSe through pair distribution function analysis". United States. https://doi.org/10.1103/PhysRevB.100.020504. https://www.osti.gov/servlets/purl/1603520.
@article{osti_1603520,
title = {Quantitative characterization of short-range orthorhombic fluctuations in FeSe through pair distribution function analysis},
author = {Frandsen, Benjamin A. and Wang, Qisi and Wu, Shan and Zhao, Jun and Birgeneau, Robert J.},
abstractNote = {Neutron and x-ray total scattering measurements have been performed on powder samples of the iron chalcogenide superconductor FeSe. Using pair distribution function analysis of the total scattering data to investigate short-range atomic correlations, we establish the existence of an instantaneous, local orthorhombic structural distortion attributable to nematic fluctuations that persists well into the high-temperature tetragonal phase, at least up to 300 K and likely to significantly higher temperatures. This short-range orthorhombic distortion is correlated over a length scale of about 1 nm at 300 K and grows to several nm as the temperature is lowered toward the long-range structural transition temperature. In the low-temperature nematic state, the local instantaneous structure exhibits an enhanced orthorhombic distortion relative to the average structure with a typical relaxation length of 3 nm. Finally, the quantitative characterization of these orthorhombic fluctuations sheds light on nematicity in this canonical iron-based superconductor.},
doi = {10.1103/PhysRevB.100.020504},
journal = {Physical Review B},
number = 2,
volume = 100,
place = {United States},
year = {Thu Jul 11 00:00:00 EDT 2019},
month = {Thu Jul 11 00:00:00 EDT 2019}
}
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FIG. 1: (a) Crystal structure of FeSe, with Fe atoms shown in brown and Se atoms in turquoise. The solid lines show the unit cell of the orthorhombic structure (space group Cmma). (b) View of the distorted iron sublattice within each layer of the crystal structure. The solid rectangle representsmore »
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