Abstract
Abstract A series of Ln0.7M0.3MnO3 perovskites (Ln=La, Pr, Nd and M=Ca, Sr, Ba) with fixed mean A-cation radius, =1.26 A and variable A cation size disorder, quantified by the variance σ3 is studied. The results on seven samples show that the electronic, magnetic and structural transitions are affected by changes in σ2. Furthermore, the Curie and metal-insulator transition temperatures are sensitive to the perovskite superstructure which changes from rhombohedral R 3 c to orthorhombic Imma as σ2 increases.
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