Abstract
The non-periodic oscillations superimposed with the monotonic growth of magneto- resistance of YBaCuO cylindrical films were measured (T<T c onset). The samples studied may be considered as composites consisting of a non-superconducting matrix with dispersed superconducting grains. A large number of closed loops with random cross sections of weakly connected superconducting grains may result in a complicate superposition of different oscillation frequencies. The destruction of weak links by applied magnetic field may lead to the observed positive magnetoresistance.
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