Ferromagnetic phases in spin-Fermion systems

Abstract

Spin-Fermion systems which obtain their magnetic properties from a system of localized magnetic moments being coupled to conducting electrons are considered. The dynamical degrees of freedom are spin-$s$ operators of localized spins and spin-1/2 Fermi operators of itinerant electrons. Renormalized spin-wave theory, which accounts for the magnon-magnon interaction, and its extension are developed to describe the two ferrimagnetic phases in the system: low temperature phase $0<T<T^{\ast }$, where all electrons contribute the ordered ferromagnetic moment, and high temperature phase $T^{\ast }<T<T_C$, where only localized spins form magnetic moment. The magnetization as a function of temperature is calculated. The theoretical predictions are utilize to interpret the experimentally measured magnetization-temperature curves of $UG{e}_2$..

9 pages, 5 figures

References in corpus (2)

• Superconducting phases of f-electron compounds
• Two Ferromagnetic Phases in Spin-Fermion Systems

Cited by in corpus (1)

• Itinerant ferromagnetism in actinide 5f electrons system: Phenomenological analysis with spin fluctuation theory