On the Possibility of Ferromagnetism and Half-Metallicity in Local Moment Systems

Abstract

We use the Kondo lattice model to investigate the possibility of ferromagnetism and half-metallicity in local moment systems. Using the spectral density approach and making use of the fact that the spontaneous magnetization of local moment and the itinerant electron polarization are coupled, we derive an expression for the paramagnetic susceptibility. The magnetic ordering temperature is determined from the singularities of the susceptibility. The magnetic phase diagram is constructed in $T-n$(band filling) plane. It is found that ferromagnetism is possible only for small values of $n$. It is also found that the temperature drives the transition of the system from half-metal to metal.

13 pages, 4 figures

References in corpus (5)

• The Electronic Structure of Europium Chalcogenides and Pnictides
• Modelling colossal magnetoresistance manganites
• Interacting spin waves in the ferromagnetic Kondo lattice model
• Implications of the Low-Temperature Instability of Dynamical Mean Theory for Double Exchange Systems
• Interplay of magnetic order and Jahn-Teller distortion in a model with strongly correlated electron system