Structural distortions of frustrated quantum spin lattices in high magnetic fields

Details Structural distortions of frustrated quantum spin lattices in high magnetic fields Structural distortions of frustrated quantum spin lattices in high magnetic fields

2005-10-21

arxiv.org/abs/cond-mat/0510582v1

physica status solidi (b), 2005, Volume 242, Issue 15 , Pages 3189 - 3194

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1002/pssb.200541098

We study the stability of some strongly frustrated antiferromagnetic spin lattices in high magnetic fields against lattice distortions. In particular, we consider a spin-s anisotropic Heisenberg antiferromagnet on the square-kagom\'{e} and kagom\'{e} lattices. The independent localized magnons embedded in a ferromagnetic environment, which are the ground state at the saturation field, imply lattice instabilities for appropriate lattice distortions fitting to the structure of the localized magnons. We discuss in detail the scenario of this spin-Peierls instability in high magnetic fields which essentially depends on the values of the exchange interaction anisotropy \Delta and spin s.

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