Abstract
Investigation of the crystal structure, magnetic ordering and magnetic properties of the compoundTbCo0.5Mn0.5O3.06 has been carried out by neutron powder diffraction and magnetization measurements. The Co andMn ions are shown to have a partial NaCl-type crystallographic ordering in the B-sublattice of theABO3 perovskite. On the basis of the magnetization study, metamagnetic behaviour has been revealed.The critical fields of the metamagnetic transition have been found to decrease with the approachto the Curie point at 98 K. The neutron diffraction experiments suggest that the compoundTbCo0.5Mn0.5O3.06 consists of ferromagnetic and spin-glass-like phases. In the absence of an external magneticfield, a small ferromagnetic component appears in the Tb sublattice. The magneticmoments are directed antiparallel to the ferromagnetic component of the Co/Mnsublattice due to a negative f–d exchange polarization. Below 10 K a short-rangeantiferromagnetic order starts to develop in the Tb sublattice. The spin-glass-like phaseassociated with the random Co/Mn distribution transforms into the ferromagneticphase under an external magnetic field, while in the Tb sublattice long-rangemagnetic order, being a superposition of the F, A, C, and G components, develops.
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