Single-Site Functional-Integral Approach to Itinerant-Electron Ferromagnetism

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概要

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• Itinerant-electron ferromagnetism at finite temperatures is discussed by usingthe functional-integral method with two fields within the static and saddle-pointapproximations combined with the single-site approximation; a single atom ofa pure metal is regarded as an impurity embedded in the host which is treated bya kind of the alloy-analogy approximation. The amplitude of the local magneticmoment is shown to have a weak temperature dependence and to remain finiteeven in the paramagnetic state, where the spin susceptibility obeys an approximateCurie-Weiss law. Numerical calculations are made with the use of a simplifiedmodel for the density of states of bcc transition metals. Calculated results arediscussed with reference to experimental data of iron.

• 社団法人日本物理学会の論文
• 1979-05-15

著者

• Hasegawa Hideo

  Institute For Solid State Physics University Of Tokyo

関連論文

• Effect of Spin Fluctuations on Itineraut Electron Antiferromagnetism
• Frequency-Dependent Electrical Conductivity of Nearly and Weakly Ferromagnetic Metals : Deviations from Drude's Formula
• Single-Siet Spin Fluctuation Theory of Itinerant-Electron Systems with Narrow Bands
• Effect of Antiferromagnetic Spin Fluctuations on Superconductivity
• Finite-Temperature Magnetism of Concentrated Ferromagnetic Alloys
• Specific Heat Due to Spin Fluctuations in Nearly and Weakly Antiferromagnetic Metals
• Single-Site Spin Fluctuation Theory of Itinerant-Electron Systems with Narrow Bands. II. Iron and Nickel
• A Unified Theory of Magnetism in Narrow Band Electron Systems
• Spin Fluctuations in Concentrated Ferromagnetic Alloys
• Paramagnon Effect on the Nuclear Spin-Lattice Relaxation in Type-I Superconductors
• Single-Site Functional-Integral Approach to Itinerant-Electron Ferromagnetism

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