Theory of Valence Tansition
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概要
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The valence transition phenomena occurring in rare-earth compounds are studied by using the periodic Anderson model with the electron-phonon coupling. This electron-phonon interaction G is treated in the Hartree-Fock approximation. The Coulomb repulsion U between f-electrons on the same site is taken to be ∞, and the decoupling method of Roth is used for the higher order Green function considering the mixing interaction to be small. We put the condition that the total number of electrons is a constant, and calculate the numbers of f- and d-electrons as functions of the original energy of f-electron by using the Green functions. The first order transition is shown to occur in G≳(1/2)W, where W is the width of the original d-band. The energy of f-electron at which the insulator and the metallic phase have the same ground state energy is calculated as [numerical formula]. The magnetic susceptibilities of both phases are also calculated, but the result is not good, showing the decoupling method used here is not appropriate for the calculation of magnetic properties.
- 理論物理学刊行会の論文
- 1981-01-25
著者
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Takano Fumihiko
Institute Of Physics The University Of Tsukuba
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Misawa Susumu
Institute Of Physics University Of Tsukuba
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TAKANO Fumihiko
Institute of Physics, University of Tsukuba
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MISAWA Susumu
Institute of Physics, University of Tsukuba
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