Jahn-Teller stabilization of a "polar" metal oxide surface: Fe3O4(001)

Details Jahn-Teller stabilization of a "polar" metal oxide surface: Fe3O4(001) Jahn-Teller stabilization of a "polar" metal oxide surface: Fe3O4(001)

2005-01-17

arxiv.org/abs/cond-mat/0501402v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.126101

Using ab initio thermodynamics we compile a phase diagram for the surface of Fe3O4(001) as a function of temperature and oxygen pressures. A hitherto ignored polar termination with octahedral iron and oxygen forming a wave-like structure along the [110]-direction is identified as the lowest energy configuration over a broad range of oxygen gas-phase conditions. This novel geometry is confirmed in a x-ray diffraction analysis. The stabilization of the Fe3O4(001)-surface goes together with dramatic changes in the electronic and magnetic properties, e.g., a halfmetal-to-metal transition.

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