Abstract
The properties of manganites can be tuned by changing the doping level x in Ln 1− xM x MnO 3. A second mechanism allows tuning of magnetic and electronic properties, for fixed x values, by varying the average A-cation radius, 〈 r A 〉. Moreover, for fixed x and 〈 r A 〉 values, the changes in the A-cation size variance, σ 2, also modify the ferromagnetic and metal–insulator transition temperatures. Here, we investigate the influence of the number of A-site cations on Ln 5/8 M 3/8MnO 3 manganites, where x, 〈 r A 〉 and σ 2 values are kept constant, and in the absence of phase separation phenomena. We have found that the number of cation species at the A site ( N A ) has a strong influence on the width of the ferromagnetic and metal–insulator transitions, and a small influence on the average transition temperature. This behavior is opposite to that observed for increasing values of the variance σ 2 in manganites, with the same x and 〈 r A 〉 values, where average transition temperatures are strongly reduced.
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