The effects of Cu-doping on the structural, magnetic, and transport properties of La0.7Sr0.3Mn1xCuxO3 (0<=x<=0.20) have been studied using neutron diffraction, magnetization, and magnetoresistance (MR) measurements. All samples show the rhombohedral structure with the R[overline 3]c space-group from 10 K to room temperature (RT). Neutron diffraction data suggest that some of the Cu ions have a Cu3+ state in these compounds. The substitution of Mn by Cu affects the MnO bond length and Mn-O-Mn bond angle resulting from the minimization of the distortion of the MnO6 octahedron. Resistivity measurements show that a metal to insulator transition occurs for the x>=0.15 samples. The x=0.15 sample shows the highest MR([approximate]80%), which might result from the co-existence of Cu3-Cu2+ and the dilution effect of Cu-doping on the double exchange interaction
M. S. Kim et al., "The Effect of Cu-Doping on the Magnetic and Transport Properties of La₀.₇Sr₀.₃MnO₃," Journal of Applied Physics, American Institute of Physics (AIP), Jan 2005.
The definitive version is available at http://dx.doi.org/10.1063/1.1860992
Materials Science and Engineering
Keywords and Phrases
Antiferromagnetic Materials; Ferromagnetic Materials; Lanthanum Compounds; Magnetisation; Magnetoresistance; Metal-Insulator Transition; Neutron Diffraction; Space Groups; Strontium Compounds; Superexchange Interactions
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