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- Title
Ferromagnetism in the Three-dimensional Hubbard Model with Generalized Type of Electron Hopping.
- Authors
Farkašovský, Pavol
- Abstract
The projector quantum Monte Carlo method is used to examine ferromagnetism in the generalized three-dimensional Hubbard model with exponentially decaying electron hopping amplitudes t ij (q) ∼ - q | R i - R j | . It is shown that this type of electron hopping, which models more realistically the electron hopping in real transition-metal materials, stabilizes the ferromagnetic state for all electron concentrations n > 1 and that the critical value of the hopping parameter q c , above which the ferromagnetic state becomes stable, is strongly reduced with increasing strength of the Coulomb interaction U. Thus already small, but physically the most realistic values of q ( q < 0.5 ), are able to generate the ferromagnetic state for intermediate and strong Coulomb interactions. This opens a new route towards the understanding of the itinerant ferromagnetism in real narrow-band metals within generalized Hubbard-type models.
- Subjects
HUBBARD model; THREE-dimensional modeling; ELECTRONS
- Publication
Journal of Superconductivity & Novel Magnetism, 2022, Vol 35, Issue 9, p2391
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-022-06221-9