Polycrystalline Lu-doped YFeO3 samples with perovskite structure were synthesized by solid-state reaction. Powder X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray analysis manifest the high quality of the samples. Room temperature 57Fe Mössbauer spectra indicate that only the Fe3+ exists in the samples, which excludes the formation of multiple valence of Fe. The large effective magnetic moments of Fe3+ obtained from the temperature dependence of magnetization data can be explained in terms of the formation of ferromagnetic clusters. Field-dependent magnetization reveals that all the samples show weak ferromagnetic property due to the small canting of the Fe3+ moments. The field-induced spin-reorientation was detected on YFeO3 and was gradually suppressed by Lu3+ doping. Polarization hysteresis loops of Y1−xLuxFeO3 (0 ≤ x ≤ 1) were observed at room temperature. Our results suggest that the multiferroic properties may exist in the Y1−xLuxFeO3 (0 ≤ x ≤ 1) ceramics.
We report the observation of current-induced abrupt transition from a metallic to an insulating state in a bilayered manganite La 1.2 Sr 1.8 Mn 2 O 7 single crystal. A colossal electroresistance effect ͓͑50 mA͒ − ͑1 mA͔͒ / ͑50 mA͒ = 93% is found at 120 K. Moreover, the current-induced transition is very sensitive to external magnetic fields. At the measuring current of 50 mA a low-field colossal magnetoresistance effect, ͓͑H͒ − ͑0͔͒ / ͑0͒ = −86%, occurs at H = 500 Oe. This low-field magnetoresistance effect can be repeatedly modulated by external magnetic field. We interpret these phenomena as the consequence of the percolative conduction and local Joule thermal effect.
9 . -The new title compound is synthesized by solid state reaction of a stoichiometric mixture of Nd2O3, BaCO3, and MnCO3 (1300°C, 12 h). TEM reveals a chemical phase separation phenomenon leading to the coexistence of the perfect 12R-type structure with an average chemical composition of Ba4NdMn3O12 (space group R3m) and the Nd-rich modulated superstructure. In the 12R-type structure, the Nd cations are located in the corner-sharing octahedra, whereas the Mn cations are located in the face-sharing octahedra, leading to a remarkable cation ordering. -(YANG, H.; TANG, Y. K.; YAO, L. D.; ZHANG, W.; LI, Q. A.; LI, F. Y.; JIN, C. Q.; YU*, R. C.; J.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.