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Title: 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:
ORCiD logo [1];  [2];  [3];  [2];  [4]
  1. Brigham Young Univ., Provo, UT (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Fudan Univ., Shanghai (China)
  3. Univ. of California, Berkeley, CA (United States)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (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 (NNSFC); MOST of China; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
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. doi: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. doi:10.1103/PhysRevB.100.020504.
@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 = {2019},
month = {7}
}

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