Magnetic structures of $δ$-O$_2$ resulting from competition of interplane exchange interactions

Details Magnetic structures of $δ$-O$_2$ resulting from competition of interplane exchange interactions Magnetic structures of $δ$-O$_2$ resulting from competition of interplane exchange interactions

2010-07-21

arxiv.org/abs/1007.3600v1

Physics

Condensed Matter

Materials Science

16 pages, 6 figures

Scientific paper

Solid oxygen is a unique molecular crystal whose phase diagram is mostly imposed by magnetic ordering, i.e., each crystal phase has a specific magnetic structure. However, recent experiments showed that high-pressure $\delta$-phase is implemented in different magnetic structures. In the present paper we study the role of interplane exchange interactions in formation of the magnetic structures with different stacking sequences of the close-packed planes. We show that temperature-induced variation of intermolecular distances can give rise to compensation of the exchange coupling between the nearest close-packed planes and result in the phase transition between different magnetic structures within $\delta$-O$_2$. Variation of the magnetic ordering is, in turn, accompanied by the step-wise variation of interplane distance governed by space and angular dependence of interplane exchange constants.

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