Effect of the A Cation Size on the Structural, Magnetic, and Electrical Properties of Perovskites (La1−xNdx)0.7Sr0.3r003nMnO3

✍ Scribed by K Cherif; J Dhahri; E Dhahri; M Oumezzine; H Vincent

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 234 KB
• Volume: 163
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9429

✦ Synopsis

An intense e4ort has recently been devoted to studying the interplay between structure, magnetism, and transport in manganese perovskite Ln 1؊x A x MnO 3 (Ln ‫؍‬ La, Pr, Nd, Sm; A ‫؍‬ Ca, Ba, Sr). As a function of temperature, applied magnetic 5eld, doping, A-site ionic radius 1r A 2, and A-site size disorder, this system displays a rich phase diagram for both magnetotransport and structural properties. We have investigated the structural, magnetic, and transport properties of (La 1؊x Nd x ) 0.7 Sr 0.3 MnO 3 . The crystal structure was examined by X-ray powder di4raction which indicated that all the samples were single phase and revealed a transition from rhombohedral to orthorhombic structure with increasing x. The magnetization and resistivity investigation shows that for all values of x, (La 1؊x Nd x ) 0.7 Sr 0.3 MnO 3 are ferromagnetic+metallic at low temperatures and paramag-netic+semiconductor above the Curie temperature T c .

2002

Elsevier Science (USA)