Abstract
We present the results of systematic study of structure, magnetic properties, and electrical transport in layered cobaltites Sr2−xPrxCoO4 (0.5≤x≤1.5). The variations of Jahn–Teller distortion of CoO6 octahedron reflected by two different Co–O bond lengths indicate that all the samples are mostly accommodated in the t2g orbital states. For x<1 samples, with increasing Pr-doping level, the tolerance factor decreases and the distortion of CoO6 octahedron enhances, which result in the increased bending of Co–O–Co bond, the narrowing of the bandwidth, and the decrease of the mobility of eg electrons caused by the substitution of smaller Pr3+ ions for a larger Sr2+ ion. For x>1 samples, the contribution of carrier density should be considered besides the tolerance factor.
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