Hund's-Rule Coupling Effect in Itinerant Ferromagnetism
Takuya Okabe
TL;DR
This paper introduces a general model encompassing the ferromagnetic Kondo lattice and Hubbard model, analyzing ferromagnetism stability and emphasizing Hund's-rule coupling's role in metallic nickel.
Contribution
It presents a unified model that captures the effects of Hund's-rule coupling on itinerant ferromagnetism, highlighting the mechanism in metallic nickel.
Findings
Hund's-rule coupling significantly stabilizes ferromagnetism.
Orbital degeneracy plays a crucial role in ferromagnetic stability.
The model unifies different ferromagnetic systems under a common framework.
Abstract
We present a general model which includes the ferromagnetic Kondo lattice and the Hubbard model as special cases. The stability of the ferromagnetic state is investigated variationally. We discuss the mechanism of ferromagnetism in metallic nickel, emphasizing the importance of orbital degeneracy and the effect of the Hund's-rule coupling.
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