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

Abstract

High-resolution single crystal neutron diffraction measurements are presented probing the magnetostructural response to uniaxial pressure in the iron pnictide parent system BaFe2s2. 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. Lastly, our data suggest that antiferromagnetism and strong magnetoelastic coupling drive the strain-activated lattice response in this material 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); Univ. of California, Santa Barbara, CA (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Univ. of California, Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); 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:
1466694
Alternate Identifier(s):
OSTI ID: 1248252; OSTI ID: 1362218
Grant/Contract Number:  
AC02-05CH11231; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 14; Related Information: © 2016 American Physical Society.; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chen, Xiang, Harriger, Leland, Sefat, Athena, Birgeneau, R. J., and Wilson, Stephen D. Strain-activated structural anisotropy in BaFe2As2. United States: N. p., 2016. 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. Wed . "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 = {High-resolution single crystal neutron diffraction measurements are presented probing the magnetostructural response to uniaxial pressure in the iron pnictide parent system BaFe2s2. 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. Lastly, our data suggest that antiferromagnetism and strong magnetoelastic coupling drive the strain-activated lattice response in this material 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}
}

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