Abstract
Heisenberg antiferromagnets for BCC lattice are investigated. Quadruple exchange interactions among neighbouring spins are taken into account in addition to the nearest neighbour and next neighbour exchanges. The model is supposed to describe low energy states of solid 3He in the BCC structure. Possible phases of spin ordering and nature of transitions among such phases are obtained. The results are exhibited in the parameter space. The spin ordering can be detected by NMR absorption. If the ordering is more complex than the normal antiferromagnetic structure for BCC lattices, NMR absorptions will be found not only at ω∝H but also at the other frequency which remains to be finite as H → 0. This frequency (optical mode frequency) is calculated and estimated at MC region.
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