Abstract
Magnetic, electric and structural properties of La0.96 − yNdyK0.04MnO3 + δ with0 ⩽ y ⩽ 0.4 have been studied experimentally. A disordered magneticstate is formed as La is substituted by Nd, reflecting the competitionbetweenferromagnetic (FM) double exchange and antiferromagneticsuperexchange interactions. Key structural parameters are identifiedand correlated with changes in magnetic and electric properties. Byapplication of a large magneticfield, spin disorder scattering is removed, creating a newmagnetoresistance peak at a temperature lower than the first near-Tcpeak. Time-dependent zero-field–cooled magnetisation measurements have beenperformed for y = 0.4 around this temperature. A re-entrant spin glass (RSG)transition is evidenced, with low field ageing properties in boththe RSG and FM phases, similar to those observed in archetypal spin glassmaterials.
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