Theory of magnetic properties of solid oxygen

It is shown that the entire set of data on the behavior of solid oxygen can be explained consistently by assuming that its magnetic subsystem is a quasi-two-dimensional Heisenberg system, whose structure changes with increasing temperature as follows: The α-phase has a quasi-two-dimensional collinear antiferromagnetic structure; in a narrow temperature range near the α–β transition there is a quasi-two-dimensional structure with helicoidal packing which, as the degree of lattice monoclinicity decreases, transforms continuously into a three-sublattice structure, as short-range order persists in the whole range of existence of the β-phase.

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