Abstract
The superconducting and magnetic properties of a series of compounds Ba2LnCu3O7−x (Ln=Pr, Nd, Sm ... Gd, Dy ... Yb) are reported and compared with corresponding measurements on the isostructural model substance Ba2YCu2O7−x . The unknownx in the oxygen concentration is obviously responsible for a nonmonotonic variation of bothT c and the lattice constants with the rare-earth size. No remarkable increase ofT c was achieved on replacing Y by a magnetic Ln. A partial substitution of Ba by Sr reducedT c, but increasedT N of Ba2GdCu3O7−x from 2.3 K to 2.65 K in BaSrGdCu3O7−x . Intrinsic pinning effects in external magnetic fields appear to be surprisingly weak at higher temperatures where technical applications of this sort of superconductors might be of interest.
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