Lattice effects on magnetic and transport properties in La 0.67-x Gd x Sr 0.33 CoO 3
C. J. ZhangSeoul National Univ. (South Korea)B. H. KimSeoul National Univ. (South Korea)J. S. KimSeoul National Univ. (South Korea)Y. W. ParkSeoul National Univ. (South Korea)
2005en
ABI
Annotatsiya
The lattice effects on the magnetic and transport properties in La<sub>0.67-x</sub>Gd<sub>x</sub>Sr<sub>0.33</sub>CoO<sub>3</sub> series are studied. The introduction of smaller Gd<sup>3+</sup> ions leads to an enhanced mismatch between the La-O layer and the CoO<sub>2</sub> layer and a decrease of the tolerance factor <i>t</i>. The spin-state of trivalent Co ion transits to low-spin state with the decrease of Co-O bond length. The doping of Gd<sup>3+</sup> drives the system from the cluster-glass state to the spin-glass state and progressively decreases the Curie temperature. At high Gd<sup>3+</sup> doping content, an interesting negative magnetoresistance occurs at low temperature.
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