Physics – Condensed Matter
Scientific paper
1997-11-11
J. Phys. Condensed Matter 9 (1997) 5449
Physics
Condensed Matter
LaTex + two EPS figures
Scientific paper
10.1088/0953-8984/9/25/012
An infinite-$U$ term is introduced into the Holstein-Primakoff-transformed magnon hamiltonian of quantum Heisenberg magnetic models of spin $s$. This term removes the unphysical spin wave states on every site and truncates automatically the expansion in powers of the magnon occupation operator. The resultant strong-coupling magnon hamiltonians are accurately equivalent to the original spin hamiltonians. The on-site $U$ levels and their implications are studied. Within a simple decoupling approximation for our strong-coupling magnon models we can easily reproduce the results for the (sublattice) magnetizations obtained previously for the original spin model. But our bosonic hamiltonians without any unphysical states allow for substantially improved values for the spectral weight in the ground state and for lower ground-state energies than those obtained within previous approximations.
Czycholl Gerd
Liu Bang-Gui
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