Antiferromagnetism in V2O3

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Abstract
Neutron diffraction measurements on powder and single‐crystal samples of V2O3 have confirmed the existence of long‐range magnetic order in the low temperature (monoclinic) phase. Paoletti and Pickart1 discovered an extra diffraction peak at low temperature which they attributed to nuclear scattering. A polarization analysis experiment on a powder sample showed that this peak was magnetic in origin. In addition, several much weaker magnetic peaks were identified. These peaks index in the monoclinic cell given by McWahn,2 with indices satisfying the relation h+k+l=2n+1. The magnetic peaks show little temperature dependence from 77°K up to the crystallographic transition at 170°K, where they vanish abruptly. On cooling, they suddenly reappear at about 154°K. The data agree with a model in which the V moments are ferromagnetically aligned in (010)m layers (perpendicular to hexagonal a axis) with a reversal between adjacent layers. The ordered moment of 1.2 μB per V atom is oriented perpendicular to the hexagonal a axis at an angle of about 71° from the hexagonal c axis.

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