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- W2071540158 abstract "We investigate the elementary excitations of quasi-one-dimensional S = ½ systems built up from zigzag chains with general isotropic exchange constants, using exact (Lanczos) diagonalization for 24 spins and series expansions starting from the decoupled dimer limit. For the ideal one-dimensional zigzag chain we discuss the systematic variation of the basic (magnon) triplet excitation with general exchange parameters and in particular the presence of practically flat dispersions in certain regions of phase space. We extend the dimer expansion in order to include the effects of three-dimensional interactions on the spectra of weakly interacting zigzag chains. In an application to KCuCl3 we show that this approach allows us to determine the exchange interactions between individual pairs of spins from the spectra as determined in recent neutron scattering experiments." @default.
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- W2071540158 date "2000-08-08" @default.
- W2071540158 modified "2023-09-23" @default.
- W2071540158 title "On the dynamics of coupledS= 1/2 antiferromagnetic zigzag chains" @default.
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- W2071540158 doi "https://doi.org/10.1088/0953-8984/12/34/309" @default.
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