Abstract
We have measured the field and temperature dependences of the logarithmic flux-creep relaxation in an oriented-grain sample of YBaCuO in the critical state. The data indicate that the effective activation energy increases continuously with increasing T between 6 and 30 K, and that (T) tends to increase rather than decrease with increasing applied field. These results are compared to predictions of the thermally activated flux-creep model.
- Received 25 September 1989
DOI:https://doi.org/10.1103/PhysRevLett.64.1561
©1990 American Physical Society