Study on Conductive and Magnetic Properties of Ag-Doped La 0.67 Sr 0.33 MnO 3

• DOI: 10.11648/j.sd.20180602.14
• Publication Date: 2018-06-22
• Authors: Renlong Wang; Mei Ming; Pan Yilu; Cheng Ganlin; Ruikun Pan; Wanqiang Cao
• Keywords: Colossal Magnetoresistance; Cobaltite

Rare-earth doped manganese oxide La 0.67 Sr 0.33 MnO 3 (LSMO) has broad application prospects in the field of spin electronics, which paramagnetic-ferromagnetic transition temperature (T c ) above room temperature. Recent research shows that Ag-doping effective improvements grain size and conductivity LSMO for improving colossal magnetoresistance effect (CMR). In this paper, sol-gel method was used to prepare : Agx（x=0, 0.5 mol%） polycrystalline powder. By using X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) photoelectron spectroscopy (XPS) technologies, microstructure, crystalline phase structure, resistivity, magnetic properties, Ag Mn valence states were tested before after doping, respectively. The analysis some atoms exist at boundary form element enhance conductivity; other go into crystal lattice replacing A site 3+ perovskite structure ABO3, obtains a small amount 2 O hybrid decreases ratio /Mn 4+ . doping weakens double exchange property LSMO. substitution with also makes minority spinon band slightly reduced, can weakly decrease