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Title: Photoinduced dynamics of nematic order parameter in FeSe

Abstract

Formation of electronic nematicity is a common thread of unconventional superconductors. We use ultrafast electron diffraction to probe the lattice interactions with electronic degrees of freedom in superconducting FeSe and find a significant lattice response to local nematicity. Here, we observe that a perturbation by a laser pulse leads to a surprising enhancement of the high-symmetry crystalline order as a result of suppression of low-symmetry local lattice distortions, which are signatures of nematic fluctuations. The distortions are present at temperatures both below and above the nematic phase transition, as corroborated by our x-ray pair distribution function analysis and transmission electron microscopy measurements. Nonequilibrium lattice behavior of FeSe reveals two distinct time scales of nematic response to photoexcitation, 130(20) and 40(10) ps, corresponding to diffusive and percolative dynamics of nematic fluctuations respectively.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [2];  [3];  [3];  [2];  [2];  [2];  [2];  [4];  [3];  [2]; ORCiD logo [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States; Columbia Univ., New York, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1529080
Alternate Identifier(s):
OSTI ID: 1518505
Report Number(s):
BNL-211799-2019-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
SC0012704; AC02-05CH11231; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 18; 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

Citation Formats

Konstantinova, Tatiana, Wu, L., Abeykoon, M., Koch, R. J., Wang, A. F., Li, R. K., Shen, X., Li, J., Tao, J., Zaliznyak, I. A., Petrovic, C., Billinge, S. J. L., Wang, X. J., Bozin, E. S., and Zhu, Yimei. Photoinduced dynamics of nematic order parameter in FeSe. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.180102.
Konstantinova, Tatiana, Wu, L., Abeykoon, M., Koch, R. J., Wang, A. F., Li, R. K., Shen, X., Li, J., Tao, J., Zaliznyak, I. A., Petrovic, C., Billinge, S. J. L., Wang, X. J., Bozin, E. S., & Zhu, Yimei. Photoinduced dynamics of nematic order parameter in FeSe. United States. doi:10.1103/PhysRevB.99.180102.
Konstantinova, Tatiana, Wu, L., Abeykoon, M., Koch, R. J., Wang, A. F., Li, R. K., Shen, X., Li, J., Tao, J., Zaliznyak, I. A., Petrovic, C., Billinge, S. J. L., Wang, X. J., Bozin, E. S., and Zhu, Yimei. Tue . "Photoinduced dynamics of nematic order parameter in FeSe". United States. doi:10.1103/PhysRevB.99.180102.
@article{osti_1529080,
title = {Photoinduced dynamics of nematic order parameter in FeSe},
author = {Konstantinova, Tatiana and Wu, L. and Abeykoon, M. and Koch, R. J. and Wang, A. F. and Li, R. K. and Shen, X. and Li, J. and Tao, J. and Zaliznyak, I. A. and Petrovic, C. and Billinge, S. J. L. and Wang, X. J. and Bozin, E. S. and Zhu, Yimei},
abstractNote = {Formation of electronic nematicity is a common thread of unconventional superconductors. We use ultrafast electron diffraction to probe the lattice interactions with electronic degrees of freedom in superconducting FeSe and find a significant lattice response to local nematicity. Here, we observe that a perturbation by a laser pulse leads to a surprising enhancement of the high-symmetry crystalline order as a result of suppression of low-symmetry local lattice distortions, which are signatures of nematic fluctuations. The distortions are present at temperatures both below and above the nematic phase transition, as corroborated by our x-ray pair distribution function analysis and transmission electron microscopy measurements. Nonequilibrium lattice behavior of FeSe reveals two distinct time scales of nematic response to photoexcitation, 130(20) and 40(10) ps, corresponding to diffusive and percolative dynamics of nematic fluctuations respectively.},
doi = {10.1103/PhysRevB.99.180102},
journal = {Physical Review B},
number = 18,
volume = 99,
place = {United States},
year = {2019},
month = {5}
}

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