Abstract
We have investigated electrical and magnetic properties of Pr0.5-xNdxSr0.5CoO3 (x = 0.0, 0.1, 0.2, 0.3, and 0.5) samples. Upon cooling, field-cooled magnetization of Pr0.5Sr0.5CoO3 shows an anomalous increase at TA = 120 K within the ferromagnetic state coupled structural and magnetic anisotropy transitions. This anomaly shifts to 88 K for x = 0.1 but its magnetization starts decreasing below Tferri = 35 K, where Tferri signals the onset of ferrimagnetic interaction between Nd(4f) and Co(3d) moments. The structural transition is absent in x ≥ 0.2. While the ferromagnetic Curie temperature decreases with increasing Nd content by 8 K, Tferri increases from 35 K for x = 0.1 to 80 K for x = 0.5. The ferrimagnetic interaction does not affect the dc resistivity. All the studied samples are metallic and magnetoresistance decreases from −6.7% for x = 0 to −0.7% for x = 0.5.
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