Abstract
For the description of electronic and magnetic properties of transition metal oxides we have taken into account the fine electronic structure of the Mn 3+ and Co 3+ ions, that results from the crystal-field, spin–orbit coupling, local lattice distortions (Jahn–Teller effect). Our model consistently explains the formation of the non-magnetic state of LaCoO 3 as due to the non-magnetic Co 3+-ion ground state caused by the Jahn–Teller effect via the trigonal lattice distortion and the magnetic insulating state for LaMnO 3. Our studies indicate that the orbital moment has to be unquenched in this description of 3d-ion compounds.
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