Zinc doping effects on the structure, transport and magnetic properties of La0.7Sr0.3Mn1−xZnxO3 manganite oxide

✍ Scribed by E.V. Sotirova-Haralambeva; X.L. Wang; K.H. Liu; T. Silver; K. Konstantinov; J. Horvat

• Publisher: Institute of Physics and National Institute of Materials Science
• Year: 2003
• Tongue: English
• Weight: 172 KB
• Volume: 4
• Category: Article
• ISSN: 1468-6996
• DOI: 10.1016/s1468-6996(03)00028-7

✦ Synopsis

The processing, microstructures and properties of La 0:7 Sr 0:3 Mn 12x Zn x O 3 perovskite manganite, with x ¼ 0; 0.1, 0.2, and 0.3 have been investigated. X-ray diffraction, scanning electron microscopy (SEM) and other characterisation methods were used to study the relations of microstructure and properties. The X-ray powder diffraction results show a single phase for the 0 , x , 0:3 region that confirms the zinc incorporation into the Mn site. The SEM images with magnification 1500 £ indicate that the studied system is a single phase. The transport measurements show decreasing of insulator to metal transition temperature, T t ; with increasing the zinc concentration on the Mn site, while the resistivity increases with increasing the zinc doping level for 0 , x , 0:1: The maximum resistivities are found at 380 and 160 K, respectively.

The PPMS measurements show that the magnetisation value is greatest for x ¼ 0:1 and drastically decrease for the parent material, as well as with increasing the zinc doping concentration above 20%, when the compound changes from ferromagnetic to paramagnetic. The paramagnetic to ferromagnetic transition temperature variations, T c ; agrees with the insulator to metal variations, T t ; from the transport measurements for the parent and 10% doped material. For zinc doping levels above 20%, the behavior of the studied system changes from ferromagnetic to paramagnetic.