Electrical properties and room temperature magnetoresistance of La0.67(Ca0.65Ba0.35)0.33MnO3/Agx composites
作者： Xiao-Bo Yuan , Yi-Hua Liu , Cheng-Jian Wang , Liang-Mo Mei
DOI: 10.1088/0022-3727/38/18/005
关键词: Phenomenological model 、 Grain boundary 、 Ferromagnetism 、 Curie temperature 、 Polaron 、 Electrical resistivity and conductivity 、 Condensed matter physics 、 Materials science 、 Magnetoresistance 、 Brillouin and Langevin functions
摘要: The electrical properties of the La0.67(Ca0.65Ba0.35)0.33MnO3/Agx composite system are systematically investigated as a function Ag-added content. Ag addition induces decrease in resistivity (ρ) and an increase temperature TP where ρ peak is located. This due to improvement grain boundaries caused by segregation on surfaces. T2 dependence data low region T < reflects that conductive mechanism ferromagnetic (FM) metallic state mainly arises from electron–electron scattering. At high temperatures, above Curie TC, for all samples follow adiabatic spin polaron hopping model. Moreover, –T curves x = 0.27 0.30 fit well phenomenological percolation model based phase segregation. result confirms coexistence FM clusters paramagnetic regions near indicates prominent intrinsic behaviour La0.67(Ca0.65Ba0.35)0.33MnO3 matrix. Note 27% molar ratio added large room magnetoresistance (MR) up 41%. value attractive study applications. good agreement experimental with Brillouin MR this accounts spin-dependent electrons among clusters.
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