Two-dimensional behaviour and magnetic ordering in the layered compound VOCl

The susceptibility of VOCl is isotropic above T N = 80.5 K and well described by a quadratic 2D-Heisenberg model with J k = -34.5 K . Neutron diffraction revealed a collinear antiferromagnetic order with a wavevector k = [ 1 2 1 2 1 2 ], the moments being along the a -axis. The order parameter follo...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 1984-11, Vol.45 (2), p.275-278
Main Authors: Wiedenmann, A., Rossat-Mignod, J., Vénien, J.P., Palvadeau, P.
Format: Article
Language:English
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Summary:The susceptibility of VOCl is isotropic above T N = 80.5 K and well described by a quadratic 2D-Heisenberg model with J k = -34.5 K . Neutron diffraction revealed a collinear antiferromagnetic order with a wavevector k = [ 1 2 1 2 1 2 ], the moments being along the a -axis. The order parameter follows a power law near T N with a critical exponent β = 0.143 in agreement with the 2D character and the anisotropy of the Ising type. Two magnetic structures, corresponding to a parallel and an antiparallel coupling between the two Bravais lattices coexist resulting from the particular value of the wave-vector k .
ISSN:0304-8853
DOI:10.1016/0304-8853(84)90018-0