On the study of Mullers model in high-temperature superconductors

We report here our analysis on Mullers model (Physica C 168 (1990) 585) by using the reported data for flux creep activation energies, at different values of AC field amplitudes H-a, in high-temperature superconductors. It is found that the values of AC field amplitude at the peak H-op are very sensitive to the values of the peak temperature T-p. Interestingly, our empirical calculations require a shift to the left-hand side of Mullers equation by similar to(-10(4)) of its zero value. Moreover, the shift is found to be strongly dependant on AC applied field amplitudes. Then we multiply the third term of its right-hand side by a new factor Asimilar to(10(-4)) for the correction. (C) 2003 Elsevier B.V. All rights reserved.