Abstract
ABSTRACTWe have provided an explanation for the EPR signal in 4H-SrMnO3, revealed at the vicinity of TN and in the paramagnetic region, as related with the doublet originating from the 4A2g subterm of the Mn4+ ion. Our calculations, taking into account the spin–orbit coupling and the crystal–field interactions with a trigonal distortion, reproduce the doublet ground state which is characterised by magnetic moment of ±0.975μB in very good agreement with experimental value of ±0.983μB. It confirms fundamental importance of the spin–orbit coupling and the orbital magnetism for description of 3d oxides. We claim that the EPR result provides a strong argument for the existence in the 4H-SrMnO3 crystal of the discrete atomic-like states with the energy separation of part of meV.
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