Anomaly of magnetization under the structural phase transition in La0.7Ca0.165Sr0.135MnO3 manganite

• Published in: Physica. B, Condensed matter Condensed matter, 2005-11, Vol.368 (1-4), p.42-45
• Main Authors: Ulyanov, A.N., Yu, S.C.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Crystal structure; Exact sciences and technology; Lanthanum manganites; Magnetic properties and materials; Magnetically ordered materials; Magnetotransport phenomena, materials for magnetotransport; Manganites; Phase transitions; Physics
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2005.06.034

A study of crystal structure and magnetization of La0.7Ca0.3−xSrxMnO3 lanthanum manganites (0.105⩽x⩽0.18) is presented. At room temperature the x=0.105, 0.12 and 0.135 samples were orthorhombic Pbnm phase, and x=0.15, 0.165 and 0.18 compositions were rhombohedral R3¯c phase. The magnetization on temperature dependence, M=M(T), for the samples (except x=0.135) showed usual (without any “kink”) behaviour. The M=M(T) curve for the x=0.135 sample revealed two-step dependence with the inflexion points at 309 and 320K. The effect is explained by a supposition that the temperatures are the Curie points of Pbnm and R3¯c phases, respectively, and caused by the structural orthorhombic–rhombohedral phase transition observed in the sample at the above temperature interval.