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Title: Quantitative characterization of short-range orthorhombic fluctuations in FeSe through pair distribution function analysis

Journal Article · · Physical Review B
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)

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
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
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1603520
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 100; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Disorder-induced electronic nematicity journal August 2019
Nanoscale degeneracy lifting in a geometrically frustrated antiferromagnet journal January 2020
Disorder-Induced Electronic Nematicity text January 2019
Nanoscale degeneracy lifting in a geometrically frustrated antiferromagnet text January 2020