Spin Gap of Two-Dimensional Antiferromagnet Representing CaV 4O 9

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概要

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• We examined a two-dimensional Heisenberg model with two exchange energies, J e and J c. This model describes localized spins at vanadium ions in a layer of CaV4O9, for which a spin gap was found by a recent experiment. Comparing the high-temperature expansion of the magnetic susceptibility with experimental data, we determined the exchange energies as $J_{\rm e}\simeq 610$ K and $J_{ c}\simeq 150$ K. By numerical diagonalization we estimated the spin gap as ${\mit\Delta}\sim 0.2J_{e}\simeq 120$ K, which is consistent with the experimental value of 107 K. Frustration by finite J c enhances the spin gap.

• Physical Society of Japanの論文
• 1996-01-15

著者

• Takano Ken′ichi

  Toyota Technological Institute

• Takano Ken'ichi

  Toyota Technological Institute, Tenpaku-ku, Nagoya 468

• Sano Kazuhiro

  Tsu, Mie 514

関連論文

• Effect of the Antiferromagnetic Fluctuation on a One-Dimensional Electron System
• Spin Gap of the One- Dimensional t-J-J' Model
• Spin Gap of Two-Dimensional Antiferromagnet Representing CaV 4O 9
• Excitation Gaps of One-Dimensional Spin-1/2 Heisenberg Models with Linearly Decreasing Exchange Interactions

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