“…Furthermore, in those compounds which are doped and expected to be superconducting, namely PrBa Cu O , (Pr Ce )SCNO, and (Pr Ce )SCTO, the anomalous Pr magnetism and 4f-electronic interactions have been linked to the mechanism responsible for the suppression of superconductivity. For both superexchange and f-electronic interactions, the overlaps of the Pr 4f and CuO planar O 2p electronic wave functions, and therefore the Pr-oxygen bond length, are expected to be critical parameters of these interactions (15-17, 22, 27, 38-40) (42)(43)(44). The WF behavior has been attributed to a canting of the ordered Cu moments away from strictly antiferromagnetic (AF) alignment under the influence of asymmetric exchange interactions as discussed by Dzyaloshinsky and Moriya (45).…”