Monday, November 26, 2012

1211.5179 (Jennifer L. Niedziela et al.)

Local structural variation as source of magnetic moment reduction in
BaFe2As2
   [PDF]

Jennifer L. Niedziela, M. A. McGuire, T. Egami
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.
View original: http://arxiv.org/abs/1211.5179

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