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In PrBa_2Cu_3O_{7-y} (Pr123) single crystals grown by the flux method thekink in the magnetic susceptibility chi_{ab}(T), connected with AFM ordering ofPr, disappears after field cooling (FC) in a field H||ab-plane whereas the kinkin chi_c(T) remains unchanged after FC in H||c-axis. This seems to be connectedwith the coupling between the Pr and Cu(2) sublattices. The Curie constant Cdetermined from the data reported for superconducting Pr123 crystals grown bytraveling-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, theconcentration of Pr in TSFZ crystal seems to be about one half of the nominalfor Pr123. Therefore, superconductivity in TSFZ samples is connected mostprobably with the partial substitution of Pr by nonmagnetic Ba.Comment: 3 pages (LaTeX), 2 embedded EPS figures. Talk given at the New3SC-2  conference, Las Vegas, 1999; to appear in the Int. J. Mod. Phys.

PrBa2Cu3O7-y: SUPERCONDUCTING OR ANOMALOUSLY MAGNETIC?

PrBa₂Cu₃O_7-y: SUPERCONDUCTING OR ANOMALOUSLY MAGNETIC?