Effect of average A-site cation radius on complex permeability of perovskite manganite La0.65Nd0.05(Sr, Ba)0.3MnO3

Abstract A series of polycrystalline perovskite samples La 0.65 Nd 0.05 (Sr, Ba) 0.3 MnO 3 were prepared by a sol–gel technique. Their permeabilities have been measured at different fields and temperatures. A pronounced dispersion of the relaxation was observed near the Curie temperature T C , which was obtained from the permeability vs. temperature curves. The effects of the average A-site cation radius 〈 r A 〉 and the A-site cation disorder parameter σ 2 ( r A ) on the permeability were investigated. With increasing 〈 r A 〉 and σ 2 ( r A ), the permeability of La 0.65 Nd 0.05 (Sr, Ba) 0.3 MnO 3 increases linearly.