Magnetic ground-state phase diagram of a multiple-spin exchange model on the triangular lattice

We investigated the ground state of a multiple-spin exchange model, which may describe magnetism of the solid 3 He layers adsorbed on graphite. The model contains four-spin exchange terms together with the conventional Heisenberg ones. Using the mean-field theory we found numerous ground-state phase...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2003-05, Vol.329, p.142-143
Main Authors: Kubo, Kenn, Momoi, Tsutomu
Format: Article
Language:English
Subjects:
Frustration
Multiple-spin exchange
Phase diagram
Solid [formula omitted] layer
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Summary:We investigated the ground state of a multiple-spin exchange model, which may describe magnetism of the solid 3 He layers adsorbed on graphite. The model contains four-spin exchange terms together with the conventional Heisenberg ones. Using the mean-field theory we found numerous ground-state phases with large numbers (up to 144) of sublattices. These phases replace the previously reported infinitely degenerate phase. A novel phase with 6-sublattice non-coplanar spin structure, where both vector and scalar chiral orders exist, appears between the 120° Néel and tetrahedral phases. This phase is replaced by a novel 12-sublattice phase under the magnetic field.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(02)01939-7