  Mn site is substituted with closed shell ions (Al, Ga. Ti, Zr and a certain
combination of Zr and Al) and also with Fe and Ru ions carrying the magnetic
moment (S=5/2 and 2 respectively) at a fixed concentration of 5 at. %.
Substitution did not change either the crystal symmetry or the oxygen
stiochiometry. All substituents were found to suppress both the metal-insulator
and ferromagnetic transition temperatures (TP(r) and TC respectively) to varied
extents. Two main contributions identified for the suppression are the lattice
disorder arising due to difference in the ionic radii (rMn3+-rM) between the
substituent (rM) and the Mn3+ ion (rMn3+) and in the case of the substituents
carrying a magnetic moment, the type of magnetic coupling between the
substituent and that of the neighboring Mn ion.
