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The lattice effects on the magnetic and transport properties in La0.67-xGdxSr0.33CoO3 series are studied. The introduction of smaller Gd3+ ions leads to an enhanced mismatch between the La-O layer and the CoO2 layer and a decrease of the tolerance factor t. The spin-state of trivalent Co ion transits to low-spin state with the decrease of Co-O bond length. The doping of Gd3+ drives the system from the cluster-glass state to the spin-glass state and progressively decreases the Curie temperature. At high Gd3+ doping content, an interesting negative
magnetoresistance occurs at low temperature.
C. J. Zhang,B. H. Kim,J. S. Kim, andY. W. Park
"Lattice effects on magnetic and transport properties in La0.67-xGdxSr0.33CoO3", Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 593229 (30 August 2005); https://doi.org/10.1117/12.623732
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C. J. Zhang, B. H. Kim, J. S. Kim, Y. W. Park, "Lattice effects on magnetic and transport properties in La0.67-xGdxSr0.33CoO3," Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 593229 (30 August 2005); https://doi.org/10.1117/12.623732