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Inelastic neutron scattering was employed to study the magnetic excitationsof Mn3+ dimers in LaMn0.1Ga0.9O3. The nearest-neighbor interaction of Mn3+ ionsis ferromagnetic in the basal (a,b)-plane, but antiferromagnetic along thec-direction, thus two different types of dimer excitations are simultaneouslypresent in the experiments. From the observed energy spectra we deriveHeisenberg-type exchange interactions Jab=0.210(4) meV and Jc=-0.285(5) meV aswell as an axial anisotropy parameter D=0.036(6) meV. These parametersconsiderably differ from those derived for the isostructural parent compoundLaMnO3 due to structural effects.

Ferromagnetic and antiferromagnetic dimer splittings in LaMn0.1Ga0.9O3