The structure and magnetic properties of Tm 1−y Y y Mn 1−x Co x O 3 with 0x 0.5 and 0 y 0.3 were investigated by X-ray diffraction, specific heat and magnetization measurements. Thulium manganite TmMnO 3 prepared by solid-state synthesis at ambient pressure is hexagonal and antiferromagnetic with a Nèel temperature T N of 86 K. The substitution of Y for Tm in TmMnO 3 does not greatly affect the fundamental hexagonal structure. The magnetization and specific heat measurement results for Tm 1−y Y y MnO 3 can be qualitatively explained in terms of the dilution effect of Tm by Y. On the other hand, the structure of TmMn 1−x Co x O 3 changes gradually from hexagonal to orthorhombic with the substitution of Co for Mn; hexagonal and orthorhombic phases coexist in samples for x 0.3 whereas TmMn 0.6 Co 0.4 O 3 is almost a single orthorhombic phase. The magnetization of TmMn 0.6 Co 0.4 O 3 in a field of 250 Oe increases rapidly at about 60 K with decreasing temperature. The difference between zero-field-cooled (ZFC) and field-cooled (FC) magnetizations increases remarkably at about 60 K. Moreover, the temperature dependences of the ZFC and the FC magnetizations exhibit peaks at about 40 and 30 K, respectively. Thus, TmMn 1−x Co x O 3 exhibits complex magnetic properties.
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