A Study of the Magnetic and Thermal Properties of Ln3RuO7 (Ln=Sm, Eu)

✍ Scribed by Daijitsu Harada; Yukio Hinatsu

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 453 KB
• Volume: 158
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9099

✦ Synopsis

Crystal structures, and magnetic, electric, and thermal properties of 6uorite related compounds Ln 3 RuO 7 (Ln ‫؍‬ Sm, Eu) have been investigated. For Eu 3 RuO 7 , a magnetic transition due to Ru 5 ؉ ions is found at T N ‫؍‬ 22.5 K on the susceptibility+temperature curve. Speci5c heat measurements also exhibit a -type anomaly at the same temperature. The MoK ssbauer spectrum measured at 10 K shows broadening of the line corresponding to magnetic splitting. For Sm 3 RuO 7 , two magnetic anomalies have been observed at 10.5 and 22.5 K from its magnetic susceptibility measurements. Below 22.5 K Ru 5 ؉ ions are antiferromagnetically coupled, and when the temperature is decreased through 10.5 K the ordering of Sm 3 ؉ ions occurs rapidly. Speci5c heat measurements show 5rst-order transition peaks at T ‫؍‬ 280 and 190 K for Eu 3 RuO 7 and Sm 3 RuO 7 , respectively. The results of magnetic susceptibility and electric resistivity measurements indicate that these transitions are structural phase transitions.