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Antiferromagnetic structure of LaFeO3 from high resolution tof neutron diffraction

1986; Elsevier BV; Volume: 59; Issue: 3-4 Linguagem: Inglês

10.1016/0304-8853(86)90431-2

1873-4766

T. Peterlin‐Neumaier, E. Steichele,

Advanced Condensed Matter Physics

The diffraction peaks (101) and (011) of LaFeO3 arising from the extremely small orthorhombic distortion (b/a = 1.002) have been here resolved for the first time. The intensity ratio R = I(101) = 2.32±0.12 indicated a clear deviation from a pure Gx antiferromagnetic configuration of Fe3+ ions requiring R = 3. Refinement of the entire measured spectrum from the powder specimen, taking the increasingly important secondary extinction into account, showed that the magnetic moments are tilted with respect to the crystallographic a-axis. Two limiting values for their orientation could be determined given by the tilt angle α = 18.2° ±6.4° in the ac-plane (Gxz) and α = 11.7° ±6.6° in the ab-plane (Gxy).