Magnetic Properties of LnMnO3 (Ln=Ho, Er, Tm, Yb, and Lu)

✍ Scribed by K. Yoshii; H. Abe

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 194 KB
• Volume: 165
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9514

✦ Synopsis

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 Mn 3+ moments is found at B90 K for LuMnO 3 , where the Lu 3+ ion has no 4f localized moment. This is ascribed to both the paramagnetism of Ln 3+ and the suppression of magnetization in the Mn 3+ sublattices arising from strong antiferromagnetic interactions between Mn 3+ . 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.