作者： R. A. Sadykov , A. V. Mikhailin , T. S. Orlova , A. Tybulewicz , A. Z. Il'yasov
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摘要: Positron diagnostics was used to determine the angular correlation curves of annihilation gamma photons in high-temperature superconducting ceramics YBa 2 Cu 3 O 7#75x and + 1.6% Ag temperature range 80-300 K. Both exhibited an anomalous behavior parameter f, equal ratio counting rate at maximum a curve tail curve, temperatures close T c interval 210-250 K The replacement copper cations YBaCuO system with silver lowered Fermi level by 1-5 eV increased probability positrons interactions core electrons