Magnetic and electronic properties of the oxygen-deficient PrBaCo2O5+δ (δ>0.50)

Abstract We have investigated the evolution of the structural and magnetic properties with δ in PrBaCo2O5+δ compounds with high oxygen content (δ=0.75, 0.85, 0.90). In zero field only the two latter are ferromagnetic (FM). PrBaCo2O5.75 presents antiferromagnetic order below TN=175 K, although a FM phase is easily induced under field. From neutron diffraction, using a single moment G-type model, the ordered moment at 2 K is found to be 1.14(6) μB/Co ion. Remarkable magnetoelastic effects occur at TN (δ=0.75), but are not observed at TC (δ=0.85,0.90).