Resonating-Valence-Bond Ground State of CaV_4O_9 Studied by the Gutzwiller-Projected Schwinger-Boson Method
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概要
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An antiferromagnetic Heisenberg model on a 175-depleted two-dinaensional square lattice, amodel of CaV.jOg, is investigated by variational Monte Carlo simulation. A prototype of a trialwave function is obtained by projecting out the doubly occupied states from the Schwinger-bosonmean-field solution. Then variational Monte Carlo simulation is performed for up to 40 x 40 sites(including 320 vacant sites). The optimized state has the lowest energy, -O.55l0J, ever reported.For this state, energies of a dimer bond and a plaquette bond, the staggered magnetization, staticstructure factor, and excitation spectrtrm are calculated. It is shown that the N!el order survivesand there is no gap at isotropic cotrpling,
- 社団法人日本物理学会の論文
- 1996-08-15
著者
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Yoshioka Daijiro
Department Of Basic Science University Of Tokyo
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Yoshioka Daijiro
Department Of Basic Science Graduate School Of Arts And Sciences University Of Tokyo
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Miyazaki Tomohiko
Department Of Basic Science University Of Tokyo
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Miyazaki Tomohiko
Department Of Basic Science Graduate School Of Arts And Sciences University Of Tokyo
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