Abstract
The orthorhombic phases of YMnO 3, HoMnO 3 and YbMnO 3 were made by transformation of the normal hexagonal phases at 1000°C and 35–40 kbar. The magnetic susceptibilities were measured from 4·2 to 400 K. Antiferromagnetic ordering is evident at 42 K for YMnO 3 and 9 K for HoMnO 3. The paramagnetic Curie temperatures were decreased considerably in magnitude from those of the hexagonal phases, being −67 K for YMnO 3, −23K for HoMnO 3 and −83 K for YbMnO 3. HoMnO 3 is metamagnetic below 9 K. In YbMnO 3 and HoMnO 3, both the rare-earth and Mn ions carry approximately their full moment. The magnetic structures are discussed in comparison with the orthoferrites. It is shown that strong Jahn-Teller distortion around the Mn 3+ ion leads to a slight reduction in the lattice parameter c(b′), and thence to the low magnetic ordering temperatures.
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