Abstract
The effect of Ho-doping and Ho-adding on the electronic transport and magnetic properties of melt-processed La0.67Ca0.33MnO3 (LCMO) is investigated by resistivity and AC susceptibility measurement. For Ho-addition of 1mol% LCMO sample (Ho-LCM), its magnetic transition temperature Tc and metal–insulator (M–I) transition temperature Tp are enhanced about 70K compared with Ho-free LCMO sample. However, for Ho-doping of 3mol% LCMO sample (Ho-doping LCM), both Tc and Tp are reduced about 35K. We give a reasonable explanation in terms of structural changes (bond distance and bond angle) gained from the XRD refinement. The nanoscale Ho distribution is consistent with the magnetic inhomogeneity induced MR which is verified by the double peaks in AC susceptibility χ″ and the drop of χ′(T) curve below Tc. The mechanism of transport of all the samples is discussed.
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