Abstract
Magnetic ordering among Pr ions occurs at a relatively high temperature of 17 K in PrBa 2 Cu 3 O 7 , but is absent in Pr 2 CuO 4 and Bi 2 Sr 2 PrCu 2 O 8 above 1.6 K. This work extends the study of magnetic properties to other Pr-containing cuprates including TlBa 2 PrCu 2 O 7 , (Pb .6 Cu .4 )Sr 2 PrCu 2 O 7 and Pb 2 Sr 2 PrCu 3 O 8 . Low temperature calorimetric and SQUID measurements show broad peaks in C and dχ dT in all cases. The onset temperatures are near 10 K, while the maxima in C as well as minima in dχ dT prevail at about 8 to 5 K. The heat capacity data provides additional information concerning the entropy associated with the magnetic anomalies and large contributions seemingly linear with temperature. © 1994.