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Title: Strain-activated structural anisotropy in BaFe 2 As 2

We present high-resolution single crystal neutron diffraction measurements that probe the magnetostructural response to uniaxial pressure in the iron pnictide parent system BaFe 2As 2. Scattering data reveal a strain-activated, anisotropic broadening of nuclear Bragg reflections, which increase upon cooling below the resolvable onset of global orthorhombicity. This anisotropy in lattice coherence continues to build until a lower temperature scale the first-order onset of antiferromagnetism is reached. This data suggest that antiferromagnetism and strong magnetoelastic coupling drive the strain-activated lattice response in thismaterial and that the development of anisotropic lattice correlation lengths under strain is a possible origin for the high temperature transport anisotropy in this compound.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Boston College, Chestnut Hill, MA (United States). Dept. of Physics; Univ. of California, Santa Barbara, CA (United States). Materials Dept.
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). NIST Center for Neutron Research
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science adn Technology Division
  4. Univ. of California, Berkeley, CA (United States). Physics Dept. and Materials Science Dept. ; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
  5. Univ. of California, Santa Barbara, CA (United States). Materials Dept.
Publication Date:
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1466694
Alternate Identifier(s):
OSTI ID: 1248252; OSTI ID: 1362218

Chen, Xiang, Harriger, Leland, Sefat, Athena, Birgeneau, R. J., and Wilson, Stephen D.. Strain-activated structural anisotropy in BaFe2As2. United States: N. p., Web. doi:10.1103/PhysRevB.93.144118.
Chen, Xiang, Harriger, Leland, Sefat, Athena, Birgeneau, R. J., & Wilson, Stephen D.. Strain-activated structural anisotropy in BaFe2As2. United States. doi:10.1103/PhysRevB.93.144118.
Chen, Xiang, Harriger, Leland, Sefat, Athena, Birgeneau, R. J., and Wilson, Stephen D.. 2016. "Strain-activated structural anisotropy in BaFe2As2". United States. doi:10.1103/PhysRevB.93.144118. https://www.osti.gov/servlets/purl/1466694.
@article{osti_1466694,
title = {Strain-activated structural anisotropy in BaFe2As2},
author = {Chen, Xiang and Harriger, Leland and Sefat, Athena and Birgeneau, R. J. and Wilson, Stephen D.},
abstractNote = {We present high-resolution single crystal neutron diffraction measurements that probe the magnetostructural response to uniaxial pressure in the iron pnictide parent system BaFe2As2. Scattering data reveal a strain-activated, anisotropic broadening of nuclear Bragg reflections, which increase upon cooling below the resolvable onset of global orthorhombicity. This anisotropy in lattice coherence continues to build until a lower temperature scale the first-order onset of antiferromagnetism is reached. This data suggest that antiferromagnetism and strong magnetoelastic coupling drive the strain-activated lattice response in thismaterial and that the development of anisotropic lattice correlation lengths under strain is a possible origin for the high temperature transport anisotropy in this compound.},
doi = {10.1103/PhysRevB.93.144118},
journal = {Physical Review B},
number = 14,
volume = 93,
place = {United States},
year = {2016},
month = {4}
}