  We studied the magnetization as a function of temperature and magnetic field
in the compounds Nd0.5Sr0.5MnO3, Nd0.5Ca0.5MnO3, Sm0.5Ca0.5MnO3, Dy0.5Ca0.5MnO3
and Ho0.5Ca0.5MnO3. Ferromagnetic, antiferromagnetic and charge ordering
transition in our samples agreed with previous reports. The intrinsic magnetic
moments of Nd3+, Sm3+, Dy3+ and Ho3+ ions experienced a short range order at
low temperatures. We also did specific heat measurements with applied magnetic
fields between 0 and 9 T and temperatures between 2 and 30 K in all five
samples. Below 10 K the specific heat measurements evidenced a Schottky-like
anomaly for all samples. However, we could not successfully fit the curves to
either a two level nor a distribution of two-level Schottky anomaly.
