Structural phase transition in Pr0.55Ca0.45MnO3 and Nd0.5Sr0.5MnO3 associated with charge ordering transition

✍ Scribed by T. Murata; T. Terai; T. Fukuda; T. Kakeshita

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 428 KB
• Volume: 481-482
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.12.205

✦ Synopsis

We have investigated the microstructure formed in association with charge ordering transition in perovskite manganites Pr 0.55 Ca 0.45 MnO 3 (PCMO) and Nd 0.5 Sr 0.5 MnO 3 (NSMO). By optical microscope observation, surface relief is observed below the charge ordering transition temperature T CO (CO represents charge ordering phase) for both of the specimens. Two surface trace analysis and Laue back reflection technique has been revealed that microstructures are composed of twinned variants which have {1 0 1} CO and {1 1 2} CO twinning planes for PCMO and NSMO, respectively. We have also investigated the magnetic field dependence of T CO by magnetization measurements and found that the T CO decreases parabolically with increasing magnetic field. This magnetic field dependence of T CO in PCMO is in good agreement with the calculated one based on the Clausius-Clapeyron equation.