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Ferromagnetic and antiferromagnetic dimer splittings in LaMn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>0</mml:mn><mml:mo>.</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Ga<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>0</mml:mn><mml:mo>.</mml:mo><mml:mn>9</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>O<mml:…
Inelastic neutron scattering was employed to study the magnetic excitations of Mn${}^{3+}$ dimers in LaMn${}_{0.1}$Ga${}_{0.9}$O${}_{3}$. The nearest-neighbor interaction of Mn${}^{3+}$ ions is ferromagnetic in the basal (a-b) plane, but antiferromagnetic along the $c$ direction; thus two different types of dimer excitations are simultaneously present in the experiments. From the observed …