  In PrBa_2Cu_3O_{7-y} (Pr123) single crystals grown by the flux method the
kink in the magnetic susceptibility chi_{ab}(T), connected with AFM ordering of
Pr, disappears after field cooling (FC) in a field H||ab-plane whereas the kink
in chi_c(T) remains unchanged after FC in H||c-axis. This seems to be connected
with the coupling between the Pr and Cu(2) sublattices. The Curie constant C
determined from the data reported for superconducting Pr123 crystals grown by
traveling-solvent floating zone (TSFZ) method (Zou et al, Phys. Rev. Lett., 80,
1074 (1998)) is about one half of that for our flux crystals. Thus, the
concentration of Pr in TSFZ crystal seems to be about one half of the nominal
for Pr123. Therefore, superconductivity in TSFZ samples is connected most
probably with the partial substitution of Pr by nonmagnetic Ba.
