Itinerant Ferromagnetism in Nickel

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概要

• 論文の詳細を見る

• To study the origin of the ferromagnetism in metallic nickel, triply-degenerate bands with 0.6 hole per site are treated in the Gutzwiller procedure, where experimentally deduced values for the on-site effective interaction energies are used. We adopt the mechanism that the Hund's-rule coupling effect combined with the hole migration process works for alighning their spin moments ferromagnetically. Owing to the screening effect of conduction electrons, the energy of the triplet configuration of the d^8 polar state is reduced to be buried in the d-bands. So the triplet state can be realized more frequency than the singlets . As a result, it is found, the itinerant ferromegnetism in nickel originates from the hopping process which involves the polarization. In the paramagnetic stste, this process is restricted more by the intraatomic correlation effect than in the ferromagnetic state. The condition requisit for realizing the ferromagnetic ground state is shown. Given also are the band-width narrowing factor and the weight of doubly occupied sites for the ferromagnetic ground state.

• 社団法人日本物理学会の論文
• 1994-11-15

著者

• Okabe Takuya

  Department Of Physics Faculty Of Science Kyoto University

関連論文

• Spin Wave and Stability of the Double Exchange Ferromagnet : Condensed Matter and Statistical Physics
• Generalization of Gutzwiller Approximation
• Electrical Conductivity of Fermi Liquids. : II. Quasiparticle Transport
• Itinerant Ferromagnetism in Nickel
• Electrical Conductivity of Fermi Liquids. I. Many-Body Effect on the Drude Weight
• Theory on the Itinerant Ferrmagnetism in the 3d-Transition Metal System
• Hund's-Rule Coupling Effect in Itinerant Ferromagnetism : Condensed Matter and Statistical Physics
• Theoretical Studies on the Double Exchange Ferromagnet

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