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Title: Dynamic Spin-Lattice Coupling and Nematic Fluctuations in NaFeAs

Abstract

We use inelastic neutron scattering to study acoustic phonons and spin excitations in single crystals of NaFeAs, a parent compound of iron-pnictide superconductors. NaFeAs exhibits a tetragonal-to-orthorhombic structural transition at T s ≈ 58 K and a collinear antiferromagnetic order at T N ≈ 45 K. While longitudinal and out-of-plane transverse acoustic phonons behave as expected, the in-plane transverse acoustic phonons reveal considerable softening on cooling to T s and then harden on approaching T N before saturating below T N. In addition, we find that spin-spin correlation lengths of low-energy magnetic excitations within the FeAs layer and along the c axis increase dramatically below T s and show a weak anomaly across T N. These results suggest that the electronic nematic phase present in the paramagnetic tetragonal phase is closely associated with dynamic spin-lattice coupling, possibly arising from the one-phonon–two-magnon mechanism.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [3];  [4];  [5];  [6];  [4];  [4];  [4];  [4];  [4];  [3]
  1. Rice Univ., Houston, TX (United States)
  2. Chalk River Labs., Chalk River, ON (Canada)
  3. Rice Univ., Houston, TX (United States); Beijing Normal Univ., Beijing (China)
  4. Beijing Normal Univ., Beijing (China)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Beijing Normal Univ., Beijing (China); Hunan Normal Univ., Changsha (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1439917
Alternate Identifier(s):
OSTI ID: 1509571
Grant/Contract Number:  
AC05-00OR22725; SC0012311
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 8; Journal Issue: 2; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Li, Yu, Yamani, Zahra, Song, Yu, Wang, Weiyi, Zhang, Chenglin, Tam, David W., Chen, Tong, Hu, Ding, Xu, Zhuang, Chi, Songxue, Xia, Ke, Zhang, Li, Cui, Shifeng, Guo, Wenan, Fang, Ziming, Liu, Yi, and Dai, Pengcheng. Dynamic Spin-Lattice Coupling and Nematic Fluctuations in NaFeAs. United States: N. p., 2018. Web. doi:10.1103/PhysRevX.8.021056.
Li, Yu, Yamani, Zahra, Song, Yu, Wang, Weiyi, Zhang, Chenglin, Tam, David W., Chen, Tong, Hu, Ding, Xu, Zhuang, Chi, Songxue, Xia, Ke, Zhang, Li, Cui, Shifeng, Guo, Wenan, Fang, Ziming, Liu, Yi, & Dai, Pengcheng. Dynamic Spin-Lattice Coupling and Nematic Fluctuations in NaFeAs. United States. doi:10.1103/PhysRevX.8.021056.
Li, Yu, Yamani, Zahra, Song, Yu, Wang, Weiyi, Zhang, Chenglin, Tam, David W., Chen, Tong, Hu, Ding, Xu, Zhuang, Chi, Songxue, Xia, Ke, Zhang, Li, Cui, Shifeng, Guo, Wenan, Fang, Ziming, Liu, Yi, and Dai, Pengcheng. Fri . "Dynamic Spin-Lattice Coupling and Nematic Fluctuations in NaFeAs". United States. doi:10.1103/PhysRevX.8.021056.
@article{osti_1439917,
title = {Dynamic Spin-Lattice Coupling and Nematic Fluctuations in NaFeAs},
author = {Li, Yu and Yamani, Zahra and Song, Yu and Wang, Weiyi and Zhang, Chenglin and Tam, David W. and Chen, Tong and Hu, Ding and Xu, Zhuang and Chi, Songxue and Xia, Ke and Zhang, Li and Cui, Shifeng and Guo, Wenan and Fang, Ziming and Liu, Yi and Dai, Pengcheng},
abstractNote = {We use inelastic neutron scattering to study acoustic phonons and spin excitations in single crystals of NaFeAs, a parent compound of iron-pnictide superconductors. NaFeAs exhibits a tetragonal-to-orthorhombic structural transition at Ts ≈ 58 K and a collinear antiferromagnetic order at TN ≈ 45 K. While longitudinal and out-of-plane transverse acoustic phonons behave as expected, the in-plane transverse acoustic phonons reveal considerable softening on cooling to Ts and then harden on approaching TN before saturating below TN. In addition, we find that spin-spin correlation lengths of low-energy magnetic excitations within the FeAs layer and along the c axis increase dramatically below Ts and show a weak anomaly across TN. These results suggest that the electronic nematic phase present in the paramagnetic tetragonal phase is closely associated with dynamic spin-lattice coupling, possibly arising from the one-phonon–two-magnon mechanism.},
doi = {10.1103/PhysRevX.8.021056},
journal = {Physical Review. X},
number = 2,
volume = 8,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevX.8.021056

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Cited by: 2 works
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