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Strain-activated structural anisotropy in BaFe2As2

  • Author(s): Chen, X;
  • Harriger, L;
  • Sefat, A;
  • Birgeneau, RJ;
  • Wilson, SD
  • et al.

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. 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.

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