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

TL;DR

This paper introduces a two-band Kondo-lattice model to analyze ferromagnetic half-metals with local moments, revealing how electron-moment interactions cause various magnetic and electronic phase transitions.

Contribution

The study develops a novel two-band Kondo-lattice model and explores its temperature-dependent magnetic and electronic properties, including phase transitions in half-metals.

Findings

Mutual influence causes first and second order magnetic phase transitions.

Identifies half-metal to semiconductor and semimetal transitions.

Provides temperature-dependent magnetization, band-structure, and spin polarization data.

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.