The magnetic lattice of mixed-valence Mn ions in La0.7​Sr0.3​MnO3​
is selectively diluted by partial substitution of Mn by Al or Ti. The
ferromagnetic transition temperature and the saturation moment decreases with
substitution in both series. The volume fraction of the non-ferromagnetic
phases evolves non-linearly with the substitution concentration and faster than
theoretically expected. By presenting the data in terms of selective dilutions,
the reduction of Tc​ is found to be scaled by the relative ionic
concentrations and is consistent with a prediction derived from molecular-field
theory.Comment: 6 pages, 5 figures, REVTex4.0. Submitted to PR