Abstract
Partial substitution of the rare-earth by calcium at the cationic site of the ABO 3 perovskites may show extraordinary effects of spin reversal due to a negative polarization between the rare-earth and the manganese networks, as it occurs in the solid solution Gd 1-x Ca x MnO 3 . We present herein similar effects in gadolinium perovskites of the Gd(Me,Mn)O 3 type, in which the manganese sublattice has been partially substituted by transition metal elements Me, leaving the gadolinium network intact. The spin reversal phenomena is observed at a critical concentration of x(Me) = 1/3, which implies an optimum number of pairs Mn 3+ -Mn 4+ . Neel temperatures of 48 and 67 K are obtained for Me = Co and Ni, respectively, at the optimum concentration of substituent. A comparison between these different solid solutions allows us to generalize the interpretation of two interacting magnetic sublattices : a Mn-based ferromagnetic one and a negatively-aligned gadolinium network.
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