CrO2: a self-doped double exchange ferromagnet

Details CrO2: a self-doped double exchange ferromagnet CrO2: a self-doped double exchange ferromagnet

1997-05-09

arxiv.org/abs/cond-mat/9705091v1

Phys. Rev. Lett. 80 N19 (1998) pp.4305-4308.

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 Figures

Scientific paper

10.1103/PhysRevLett.80.4305

Band structure calculations of CrO2 carried out in the LSDA+U approach reveal a clear picture of the physics behind the metallic ferromagnetic properties. Arguments are presented that the metallic ferromagnetic oxide CrO2 belongs to a class of materials in which magnetic ordering exists due to double exchange (in this respect CrO2 turns out to be similar to the CMR manganates). It is concluded that CrO2 has small or even negative charge transfer gap which can result in self-doping. Certain experiments to check the proposed picture are suggested.

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