Magnetic properties of LnMnO(3) (Ln=Ho, Er,Tm,Yb, and Lu)

摘要

Magnetic data are presented for LnMnO(3) (Ln = Ho, Er, Tm, Yb, and Lu) having the hexagonal crystal structure of P6(3)cm. DC magnetization measurements show that magnetic order is not clearly observed for Ln = Ho-Yb, while an antiferromagnetic transition of the Mn3+ moments is found at similar to90 K for LuMnO3, where the Lu3+ ion has no 4f localized moment. This is ascribed to both the paramagnetism of Ln(3+) an the suppression of magnetization in the Mn3+ sublattices arising from strong antiferromagnetic interactions between Mn Deviation from the Curie-Weiss law at low temperatures indicates the onset of antiferromagnetism. Some magnetization data of Ca-substituted compounds, Ln(0.5)Ca(0.5)MnO(3), which have the different crystal structure of orthorhombic Pnma, are also discussed briefly. (C) 2002 Elsevier Science (USA). [References: 21]