Ground state properties, excitation spectra and phase transitions in the and bilayer Heisenberg models on the honeycomb Lattice
arXiv:1111.6529 · doi:10.1103/PhysRevB.85.014428
Abstract
Motivated by the observation of a disordered spin ground state in the material BiMnONO, we study the ground state properties and excitation spectra of the (and for comparison ) bilayer Heisenberg model on the honeycomb lattice, with and without frustrating further neighbor interactions. We use series expansions around the Néel state to calculate properties of the magnetically ordered phase. Furthermore, series expansions in , where is an in-plane exchange constant and is the exchange constant between the layers are used to study properties of the spin singlet phase. For the unfrustrated case, our results for the phase transitions are in very good agreement with recent Quantum Monte Carlo studies. We also obtain the excitation spectra in the disordered phase and study the change in the critical when frustrating exchange interactions are added to the system and find a rapid suppression of the ordered phase with frustration. Implications for the material BiMnONO are discussed.
5 pages, 6 figures
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