Competition between Electron-Electron and Electron-Lattice Interactions : Four-Site-Four-Electron Model
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概要
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Competition between the electron-electron and the electron-lattice interactionsis studied with the 4-site-4-electron model characterized by B (half of the bandwidth), U (on-site Coulomb repulsion) and S (lattice relaxation energy). In thewhole range of B, U and S the lowest adiabatic potential is exactly calculated, andall of its minima and their existence conditions are found. The absolute minimumis the antiferromagnetic phase (with antiferromagnetic spin correlation but nolattice distortion) or the charge density wave phase (with alternating latticedistortion). The first-order transition between them occurs along a line close toU=S. Electronic and structural properties of these two phases are studied indetail. System size dependence of the phase diagram is discussed, with the emphasison the difference between 4n- and (4n -l- 2)-electron systems.
- 社団法人日本物理学会の論文
- 1983-12-15
著者
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Toyozawa Yutaka
Institute For Solid State Phate Physics University Of Tokyo
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TAKIMOTO Jun-ichi
Institute for Molecular Science
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Takimoto Jun-ichi
Institute For Solid State Physics The University Of Tokyo
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