Critical behavior in Ga-doped manganites La0.75(Sr,Ca)0.25Mn1−xGaxO3 (0≤x≤0.1)

► Critical properties of AMn1−xGaxO3 at the FM-PM transition have been analyzed. ► Critical exponents for AMnO3 are close to those for the 3D-Heisenberg. ► Change in the universality class is due to the dipole-dipole interaction. ► Critical behavior of the transition formanganites is sensitive to the Mn-site.