Abstract
Structural, magnetic, and transport properties of polycrystalline La0.7Ca0.3Mn1−xScxO3 have been experimentally investigated. Single-phase samples are obtained in the range 0⩽x⩽0.25 by the soft chemical synthesis route. The substitution of Sc3+ at the Mn site results in reductions in the Curie temperature Tc and in the magnetic moment per Mn ion. The Tc transition temperature becomes broader with x, and the magnetic spontaneous state has changed into a cluster glass state for the sample of x=0.1. In addition, great enhancement in resistance and magnetoresistance effect is observed in the Sc-doped samples. In our case the notable doping effects can be mainly ascribed to the variation in the Mn3+–O2−–Mn4+ network and to the magnetic disorder caused by the presence of the large and nonmagnetic Sc3+ ions in the Mn sublattice.
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