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

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

2011-07-15

arxiv.org/abs/1107.3061v1

Modern Physics Letters B 25 (2011) 1701-1712

Physics

Condensed Matter

Materials Science

13 pages, 4 figures

Scientific paper

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.

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