Abstract
The effect of nonmagnetic Ti4+ substitution for Mn4+ on magnetic ordering of La1−xPbxMn1−yTiyO3 (x=0.15,0.26, and 0.4; 0⩽y⩽x ) has been studied. The ferromagnetic transition temperature and the magnetization decrease with increasing amount of titanium. Complete substitution of Mn4+ by Ti4+, for x=y, excludes the Mn3+–O–Mn4+ double exchange. However, these compounds still show ferromagnetism if the dilution of the Mn sublattice by Ti is small enough (y⩽0.2). This ferromagnetism probably originates from a ferromagnetic Mn3+–O–Mn3+ superexchange. A thorough study of magnetic properties including AC magnetic susceptibility, magnetization, temperature dependence of coercivity and relaxation of remanent magnetization has been carried out and gives evidence of cluster spin glass behaviour for La0.6Pb0.4Mn0.6Ti0.4O3.
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