Abstract
The characteristics determining different contributions to the magnetic susceptibility at T > TC (Pauli susceptibility, coherence length at T = 0, and Curie constant) as functions of the degree of structural disorder have been analyzed for high-temperature superconducting YBa2Cu3Oy samples ( y ≈ 6.92, TC ≈ 92 K) with micrometer and submicron average grain sizes Dav. It is shown that the decrease in these characteristics, which is observed in fine-grained samples with a decrease in Dav, occurs in various ways, depending on the number and type of oxygen vacancy ordering in chain planes.
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