LAUSR

Abstract La 0.7 Ca 0.3 Mn 0.95 M 0.05 O 3 ( M = Mn, Al, 0.5Al+0.5In, and In) perovskites ( AB O 3 ) were studied with x-ray diffraction and AC susceptibility measurements. We provide the phenomenological expressions for the electron bandwidth, W , and Curie temperature, T C , to describe the variance in these values caused by the change of the degree of doping in the A - position and of the type of dopant in the B -position. The observed decrease in T C with doping is found to be mostly related to the difference in the electron configuration of Mn 3+ ions and dopant M , and partially caused by the change in the local crystal structure because of the difference in the Mn 3+ - and M- ion radii.