William G. Van der Sluys, Alfred P. Sattelberger, et al.
Polyhedron
Two novel flux creep related phenomena in YBa2Cu3O7-δ films are presented: a sharp onset of nonequilibrium optical response and a thermally activated electrical resistivity with logarithmic current dependence of the activation energy. This nonlinear current dependence is significantly different from the predictions of the standard flux creep model. © 1989.