Theory of magnetic properties of solid oxygen
V. A. SlyusarevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovYu. A. FreĭmanPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovR. P. YankelevichPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
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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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