JETP Letters -- December 10, 1990 -- Volume 52, Issue 11 pp. 630-635

Evidence of classical percolation theory in the transport properties of ceramic YBa2Cu3O7 - delta

V. F. Gantmakher, A. M. Neminskii, and D. V. Shovkun
Institute of Solid State Physics, Academy of Sciences of the USSR

Percolation theory is used for a comparative analysis of curves of the superconducting transition in ceramic YBa2Cu3O7 - delta in a zero magnetic field found through measurements of the resistance, R(T), and the dynamic susceptibility, chi(T). When there is an oxygen deficiency (delta > 0), the grains have a wide distribution with respect to the superconducting transition temperature Tc.

PACS: 74.70.Vy, 74.60.Mj