Journal
PHYSICA B-CONDENSED MATTER
Volume 378-80, Issue -, Pages 884-885Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2006.01.324
Keywords
spin-lattice coupling; frustrated antiferromagnet; valence bond solid; single mode approximation; YMnO3
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Lattice-coupled antiferromagnetic spin model is analyzed for a number of frustrated lattices. In the pyrochlore lattice, a uniform hexagon contraction can take place and reduce the exchange energy within the hexagonal cluster. In the triangular and kagome lattice, the mean-field theory predicts lack of lattice displacement. However, after considering the possibility of valence-bond formation, we argue that a type of valence-bond-solid order can be stabilized through spin-lattice interaction and leads to lattice deformation in the triangular structure. Excitation spectrum for the lattice-deformed ground state is worked out, which differs from the conventional spin waves and is in principle observable in neutron scattering. (c) 2006 Elsevier B.V. All rights reserved.
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