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Structural distortions of frustrated quantum spin lattices in high magnetic fields
Author(s) -
Derzhko Oleg,
Richter Johannes,
Schulenburg Jörg
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541098
Subject(s) - condensed matter physics , antiferromagnetism , magnon , physics , ferromagnetism , anisotropy , lattice (music) , instability , heisenberg model , spin (aerodynamics) , square lattice , ground state , quantum fluctuation , frustration , quantum , quantum mechanics , ising model , thermodynamics , acoustics
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‐kagomé and kagomé 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 Δ and spin s . (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)