Abstract
Solid solutions of Tb1−xYxCo3B2 (x = 0.05,0.1, 0.25, 0.4 and 0.5) were studied by neutron powder diffraction, x-ray diffraction, AC susceptibilityand SQUID magnetization measurements. Their magnetic and crystallographic properties werededuced and examined together with those previously published for the end compounds (x = 0,1).These solid solutions have hexagonal symmetry and are paramagnetic at RT, and undergo a magneticordering transition of the Co sublattice, with the magnetic moments along the hexagonal axis, atTCo∼150(15) K, independent of Y concentration. A second magnetic ordering transition of the Tb sublatticeTTb≤30 K accompanied by the rotation of the magnetic moments towards thebasal plane, was observed for solid solutions with Y concentrationx≤0.25. This transition was also found to be accompanied by a crystallographic symmetrydecrease. Unexpectedly, neutron powder diffraction showed that the magnitude ofthe ordered magnetic moment of the Tb ion decreases with Tb concentration.
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