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The effects of Cu-doping on the structural, magnetic, and transportproperties of La0.7Sr0.3Mn1-xCuxO3 (0 < x < 0.20) have been studied usingneutron diffraction, magnetization and magnetoresistance (MR) measurements. Allsamples show the rhombohedral structure with the R3c space-group from 10K toroom temperature (RT). Neutron diffraction data suggest that some of the Cuions have a Cu3+ state in these compounds. The substitution of Mn by Cu affectsthe Mn-O bond length and Mn-O-Mn bond angle resulting from the minimization ofthe distortion of the MnO6 octahedron. Resistivity measurements show that ametal to insulator transition occurs for the x more than 0.15 samples. The x =0.15 sample shows the highest MR(_80%), which might result from theco-existence of Cu3+/Cu2+ and the dilution effect of Cu-doping on the doubleexchange interaction.Comment: a zip fil

The effect of Cu-doping on the magnetic and transport properties of La0.7Sr0.3MnO3