An AC susceptibility study of strontium cobaltates, Ln1-xSrxCoO3-δ where Ln = Y, Ho and Dy

Abstract

We discuss the AC susceptibility of members of the Ln1-xSrxCoO3-δ family of materials where 0.66 ≤ x ≤ 0.9 and Ln = Y, Dy and Ho. The materials exhibit ferro- or ferrimagnetic ordering below room temperature. Despite the disorder introduced by mixed Co valence states, no glassiness is apparent in the imaginary part of the AC susceptibility or in the frequency dependence of the transition temperature. In addition, in the Dy and Ho materials it is found that the rare earth moments do not couple to the Co magnetic lattice.