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

Abstract

We introduce a two-band Kondo-lattice model to describe ferromagnetic half-metals with local magnetic moments. In a model study, the electronic and magnetic properties are presented by temperature dependent magnetization curves, band-structures, spin polarizations and plasma frequencies. These are obtained from numerically evaluated equations, based on the single-electron Green functions. We show that the mutual influence between the itinerant electrons and the local magnetic moments is responsible for several phase transitions of the half-metals, namely first and second order magnetic phase transitions, as well as half-metal to semiconductor and half-metal to semimetal transitions.

10 pages, 5 figures, submitted to Journal of Physics: Condensed Matter

References in corpus (4)

• Introduction to half-metallic Heusler alloys: Electronic Structure and Magnetic Properties
• The Electronic Structure of Europium Chalcogenides and Pnictides
• Uniform hopping approach to the FM Kondo Model at finite temperature
• Electronic properties of EuB6 in the ferromagnetic regime: Half-metal versus semiconductor