We argue that in lightly hole doped perovskite-type Mn oxides the holes Mn4+ sites) are surrounded by nearest neighbor Mn3+ sites in which the occupied 3d orbitals have their lobes directed towards the central hole (Mn4+) site and with spins coupled ferromagnetically to the central spin. This composite object, which can be viewed as a combined orbital-spin-lattice polaron, is accompanied by the breathing type (Mn3+) and Jahn-Teller type (Mn3+) local lattice distortions. We present calculations which indicate that for certain doping levels these orbital polarons may crystallize into a charge and orbitally ordered ferromagnetic insulating state.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2001|
ASJC Scopus subject areas