The activation energy U(T, H) in Er-doped melted textured growth YBa2Cu3O7-delta crystal

摘要

A direct method to calculate the activation energy from the resistance transition is proposed for high temperature superconductors (HTSCs). It is applied to Er-doped melted textured growth (MTG) YBa2Cu3O7-delta (YBCO) crystals. The activation energy is found to be U(T, H) = (T-p - T)(m) (H/H-0)(-beta), with m = 2.1 +/- 0.2 and beta = 0.97. All the low temperature data are scaled onto a straight line by the plot of In R/R-n versus (T-p-T)(m)(H/H-0)(-beta)/T, which supports the proposed method.