Local structural variation as source of magnetic moment reduction in BaFe2As2

Abstract

We report time-of-flight neutron powder diffraction results on stoichiometric BaFe2As2. Pair distribution function analysis shows that the orthorhombic distortion in the a-b plane at short distances are significantly different from the average lattice distortion, indicating local variations in the lattice at the short-range. We propose that this local variation reflects a high density of nano-twins, short-ranged structures which locally affect the magnetic alignment. This results suggests that the discrepancies between the observed and calculated magnetic moments in BaFe2As2 arise partly from short-ranged variation of the lattice in the a-b plane.

arXiv commentAccepted in Phys. Rev. B

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• The magnetic moment enigma in Fe-based high temperature superconductors
• Photoinduced ultrafast dynamics of local nematicity and lattice distortions in FeSe crystals
• Diverging Nematic Susceptibility, Physical Meaning of T* scale, and Pseudogap in the Spin Fermion Model for Pnictides
• Random-strain-induced correlations in materials with intertwined nematic and magnetic orders
• Temperature dependent As K-edge EXAFS studies of LaFe1-xCoxAsO (x = 0.0 and 0.11) single crystals
• Strain-activated structural anisotropy in BaFe2As2
• Low-energy, planar magnetic defects in BaFe2As2: nanotwins, twins, antiphase and domain boundaries
• Lattice Disorder Effect on Magnetic Ordering of Iron Arsenides