Metal insulator transition in TlSr2CoO5 from orbital degeneracy and spin disproportionation

Details Metal insulator transition in TlSr2CoO5 from orbital degeneracy and spin disproportionation Metal insulator transition in TlSr2CoO5 from orbital degeneracy and spin disproportionation

2000-10-17

arxiv.org/abs/cond-mat/0010239v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 9 figures

Scientific paper

10.1103/PhysRevB.64.075104

To describe the metal insulator transition in the new oxide TlSr2CoO5 we investigate its electronic structure by LDA and model Hartree-Fock calculations. Within LDA we find a homogeneous metallic and ferromagnetic ground state, but when including the Coulomb interaction more explicitly within the Hartree-Fock approximation, we find an insulating state of lower energy with both spin and orbital order. We also interpret our results in terms of a simple model.

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