Large S Approach to the Frustrated Heisenberg Model for CaV_4O_9:Commensurate Spin Configurations and Quantum Fluctuations
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Three kinds of classical spin configtnrations relevant to the frustrated Heisenberg model forCab,too are obtained. These configtrrations are characterized by the wave vectors (0,0), (7T, O)and ('r, 'r), respectively. Especially, the configuration with (77, O), which is stabilized when nextnearest neighbor cotuplings are strong enotugh, is not the f'otrr-sublattice N!el strtrctture. Spin-wavecalctrlations around these configtrrations are carried out to estizauate the naagnittrde of' quantumflucttrations in the case of S : X/2 and ground state phase diagranas are presented,
- 一般社団法人日本物理学会の論文
- 1997-07-15
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