Magnetic and structural properties of Pr(1-x)A(x)CoO(3) (A = Sr and Ba)

Magnetic properties of Pr(1-x)A(x)CoO(3) (A = Sr and Ba) have been investig ated for 0 less than or equal to x less than or equal to 0.5. While the end compound PrCoO3 exhibits no magnetic order, the Sr and Ba substitution for Pr leads to ferromagnetic order with the Curie temperature Tc less than or equal to similar to 250 K. For Pr1-xBaxCoO3, T-C has a maximum of similar to 190 K at x = 0.3-0.4. while Pr1-xSrxCoO3 shows a monotonic increase in T c with increasing x. Magnetization at 4.5 K changes almost linearly with lo garithm of time, indicating the existence of extremely slow relaxation proc esses such as spin- or cluster-glasses. (C) 2001 Elsevier Science B.V. All rights reserved.