Akademik Veri Yönetim Sistemi
JOURNAL OF APPLIED PHYSICS, cilt.80, sa.4, ss.2317-2320, 1996 (SCI-Expanded)
Structural and electrical properties of YBa(2-x)Sr(x)Cu3O(y) prepared under ambient oxygen pressure were systematically investigated for 0 less than or equal to x less than or equal to 2.0. Samples with high Sr contents, x greater than or equal to 1.7, showed semiconductive properties with an activation energy of similar to 150 meV at high temperature, T greater than or equal to 80 K. At low temperatures, T less than or equal to 80 K, activation energy dropped to similar to 3.00 and similar to 0.85 meV for x=1.7-1.8 and x=1.9-2.0, respectively. It is argued that YSr2Cu3Oy is likely to have a tetragonal structure and that the disorder introduced by Sr substitution affects electrical conduction, which involves charge hopping between the CuO chains at high Sr contents. (C) 1996 American Institute of Physics.