Origin of the Field-Induced SDW in the Bechgaard Salts

概要

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The energetic gain giving rise to the magnetic-field-induced SDW state inthe Bechgaard salts is clarified to originate in the effect of the field to the electronicorbital motion. A variational total energy of the SDW state under the field is ob-tained on the basis of the anisotropic two-dimensional Hubbard model. Its semi-classical and fully quantum evaluations for the case of the most basic set of theSDW wave vector and the magnetization clearly show a gain of the total energyunder the field, which is in fair agreement with the observed increase of the per-pendicular magnetic susceptibility. The total energy proves to be lowered byquantization of the closed orbits, since the zero-field state density in the energyregion of closed-orbits is a decreasing function of energy. The nature of thesuccessive SDW phase transitions under the field is briefly discussed.
社団法人日本物理学会の論文
1985-03-15