Abstract
Abstract Magnetic measurements of (Nd 0.33 Eu 0.38 Gd 0.28 )Ba 2 Cu 3 O y showed an exceptionally high-irreversibility field. This feature was always correlated with the presence of a superconducting matter modulation and formation of a special nanometer-scale lamellar structure. High-magnification scanning tunneling microscope observations revealed that such nanoscopic lamellas consist of arrays of aligned NEG-rich clusters of 3–4 nm in size. Routinely prepared NEG-123 samples with Nd:Eu:Gd=1:1:1 exhibit B irr of around 7 T, while the material with Nd:Eu:Gd=1:1.25:0.85 combined with addition of 5 mol% 211 secondary phase exhibits the irreversibility line above 14 T at 77 K ( H a ∥ c -axis).
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