Two Ferromagnetic Phases in Spin-Fermion Systems

Details Two Ferromagnetic Phases in Spin-Fermion Systems Two Ferromagnetic Phases in Spin-Fermion Systems

2007-09-12

arxiv.org/abs/0709.1759v2

Physical Review B 77, 012405 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.77.012405

We consider spin-fermion systems which get their magnetic properties from a system of localized magnetic moments being coupled to conducting electrons. The dynamical degrees of freedom are spin-$s$ operators of localized spins and spin-1/2 fermi operators of itinerant electrons. We develop modified spin-wave theory and obtain that system has two ferromagnetic phases. At the characteristic temperature T* the magnetization of itinerant electrons becomes zero, and high temperature ferromagnetic phase (T*

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