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We introduce a two-band Kondo-lattice model to describe ferromagnetichalf-metals with local magnetic moments. In a model study, the electronic andmagnetic properties are presented by temperature dependent magnetizationcurves, band-structures, spin polarizations and plasma frequencies. These areobtained from numerically evaluated equations, based on the single-electronGreen functions. We show that the mutual influence between the itinerantelectrons and the local magnetic moments is responsible for several phasetransitions of the half-metals, namely first and second order magnetic phasetransitions, as well as half-metal to semiconductor and half-metal to semimetaltransitions.

Two-band ferromagnetic Kondo-lattice model for local-moment half-metals