Magnetism without magnetic impurities in oxides ZrO2 and TiO2

Details Magnetism without magnetic impurities in oxides ZrO2 and TiO2 Magnetism without magnetic impurities in oxides ZrO2 and TiO2

2007-11-02

arxiv.org/abs/0711.0280v1

Physics

Condensed Matter

Materials Science

7 pages, 5 figures, submitted

Scientific paper

10.1063/1.2936858

We perform a theoretical study of the magnetism induced in transition metal dioxides ZrO2 and TiO2 by substitution of the cation by a vacancy or an impurity from the groups 1A or 2A of the periodic table, where the impurity is either K or Ca. In the present study both supercell and embedded cluster methods are used. It is demonstrated that the vacancy and the K-impurity leads to a robust induced magnetic moment on the surrounding O-atoms for both the cubic ZrO2 and rutile TiO2 host crystals. On the other hand it is shown that Ca-impurity leads to a non magnetic state. The native O-vacancy does not induce a magnetic moment in the host dioxide crystal.

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