Magnetic and Neutron Diffraction Study on Perovskites La1−xSrxCrO3

✍ Scribed by Keitaro Tezuka; Yukio Hinatsu; Akio Nakamura; Toshiya Inami; Yutaka Shimojo; Yukio Morii

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 332 KB
• Volume: 141
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7961

✦ Synopsis

Magnetic properties of perovskite-type compounds La 1؊x Sr x CrO 3 (x ‫؍‬ 0, 0.05, 0.10, 0.15, 0.20, and 0.25) have been reported. Their DC magnetic susceptibilities were measured from 4.5 K to 320 K. All these compounds showed an antiferromagnetic transition and their Ne´el temperatures decreased linearly from 286 K for LaCrO 3 with increasing Sr substitution. Below the Ne´el temperatures, other two magnetic transitions were furthermore observed for almost all the compounds. Below the Ne´el temperatures, all the compounds except LaCrO 3 showed magnetic hysteresis. The initial magnetization curve indicates the existence of the metamagnetic property below 20 K. Powder neutron measurements were performed at room temperature, 250 K and 50 K for La 0.85 Sr 0.15 CrO 3 . It was found that the crystal phase and magnetic transition occurred between 50 K and 250 K. The crystal structure at 250 K is rhombohedral with space group R3 c, and it transforms to an orthorhombic structure with space group Pnma at 50 K. The magnetic structures at 50 K and at 250 K are both the G-type. The direction of magnetic moments is directed to [111] of the rhombohedral unit cell at 250 K and changes to be parallel to the z-axis of the orthorhombic unit cell (Pnma) at 50 K.