Theory on the Itinerant Ferromagnetism in the -transition metal systems
arXiv:cond-mat/9602058 · doi:10.1143/JPSJ.65.1056
Abstract
Keeping nickel, cobalt and iron in mind, we investigate the origin of the itinerant ferromagnetism. In so doing, we generalize the Gutzwiller approximation. In that,we take account of the effect of the band degeneracy and the Hund's-rule coupling in addition to the on-site repulsion. After the discussion on nickel, the condition for the incomplete ferromagnetism, observed in cobalt and iron, is argued. Phase diagrams, which show the interplay between the band shape peculiarity and the Hund's-rule coupling, are given. It is found that for the -transition metal systems, both of the Hund's-rule coupling and the special feature of the density of states are necessary to explain the itinerant ferromagnetism.
To be published in J.Phys.Soc.Jpn
Cited by in corpus (15)
- Multi-band Gutzwiller wave functions for general on-site interactions
- Thermoelectricity in correlated narrow-gap semiconductors
- Slave-Boson Functional-Integral Approach to the Hubbard Model with Orbital Degeneracy
- A Quantum Monte Carlo Method and Its Applications to Multi-Orbital Hubbard Models
- Slave-Boson Mean-Field Theory of the Antiferromagnetic State in the Doubly Degenerate Hubbard Model - the Half-Filled Case -
- Gutzwiller-correlated wave functions for degenerate bands: exact results in infinite dimensions
- Itinerant ferromagnetism in the multiorbital Hubbard model: a dynamical mean-field study
- Properties of Gutzwiller wave-functions for multi-band models
- Ground state ferromagnetism in a doubly orbitally degenerate model
- Generalization of Gutzwiller Approximation
- The Metal-Insulator Transition in the Doubly Degenerate Hubbard Model
- Numerical Study for the Ground State of Multi-Orbital Hubbard Models
- Jahn-Teller polarons and their superconductivity in a molecular conductor
- A coefficient average approximation towards Gutzwiller wavefunction formalism
- Ground-state and Excitation spectra of Bose-Fermi Mixtures in a Three-Dimensional Optical Lattice