Abstract
The anisotropy of the magnetic susceptibility of CuO has been measured. In both, the paramagnetic and the antiferromagnetic state the susceptibility can be described to a good approximation by
whereχ a ,χ b andχ c are the ξ-values along the crystallographica,b andc axes respectively and α, β, γ are the angles of the magnetic field, direction with respect to these axes. AtT N 2=212 K apositive jump in ξ is observed forB 0 parallel to the crystallographicb-axis and a negative jump (with increasing temperature) forB 0 parallel to thec-axis, but no effect at all is observed for fields along thea-axis. It is argued that CuO behaves like a low dimensional antiferromagnet due to strong magnetic interactions along thea-direction. ForT→O the parallel susceptibility e.g.χ b remains finite, indicating that the copper moments include appreciable orbital contributions.
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Köbler, U., Chattopadhyay, T. On the magnetic anisotropy of CuO. Z. Physik B - Condensed Matter 82, 383–386 (1991). https://doi.org/10.1007/BF01357183
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DOI: https://doi.org/10.1007/BF01357183