Magnetic structure of<i>β</i>-oxygen

Treating the spins classically, we show that for \ensuremath{\beta}-${\mathrm{O}}_{2}$ the two-dimensional three-sublattice structure is unstable with respect to interlayer exchange couplings. The energetically most favorable structure is found to be incommensurate. Quantum-mechanical spin-wave calculations agree with the conclusions from the classical magnetic-structure calculations.

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