Phys. Rev. Lett. 95, 137206 (2005) [4 pages]Two-Step Restoration of SU(2) Symmetry in a Frustrated Ring-Exchange MagnetReceived 23 December 2004; published 22 September 2005 We demonstrate the existence of a spin-nematic, moment-free phase in a quantum four-spin ring-exchange model on the square lattice. This unusual quantum state is created by the interplay of frustration and quantum fluctuations that lead to a partial restoration of SU(2) symmetry when going from a four-sublattice orthogonal biaxial Néel order to this exotic uniaxial magnet. A further increase of frustration drives a transition to a fully gapped SU(2) symmetric valence bond crystal. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.137206
DOI:
10.1103/PhysRevLett.95.137206
PACS:
75.10.Jm, 75.40.Cx, 75.40.Mg
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