Phase transition in perovskites

Abstract

Transport and magnetic properties of have been studied to construct the magnetic phase diagram. is found to be a weak ferromagnet with K. Anomalous magnetic behaviour of x = 0 and x = 0.1 compositions is attributed to the Nd-sublattice magnetic contribution. Materials with and are suggested to be mixtures of antiferromagnetic and ferromagnetic states. The inhomogeneous ferromagnets exhibit the giant magnetoresistance effect without the temperature-induced metal-insulator transition. The results are discussed in terms of the superexchange interaction model proposed by Goodenough.