JETP Letters -- April 25, 1990 -- Volume 51, Issue 8 pp. 471-476

Evolution of transport properties of ceramic YBa2Cu3O7 - x as oxygen is removed by heat treatment

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

The change in the temperature dependence of the resistance, R(T), of ceramic YBa2Cu3O7 - x as oxygen is removed from the sample has been studied. The superconducting transition temperature shifts progressively downward in the process. There is no significant broadening of the transition. The temperature dependence of the resistivity, rho(T), is linear, with a progressively increasing slope, only at T > 400 K. It is suggested that oxygen condenses on Cu-O chains at T [approximately-equal-to] 400 K.

PACS: 74.60.Mj, 74.70.Vy, 81.40.Rs, 72.80.Ga