Frequency and amplitude responses of ac susceptibility in high temperature superconductors

According to the scaling function of vortex glass phase transition, a general description for the peak temperatures TP of frequency- and amplitude-dependent ac susceptibility has been deduced for high temperature superconductors. The description can be written as lnω0ωPBnhacμ=A(1−tP)q. This description is in good agreement of the experiments in our melt-textured YBCO and Pb doped Hg-1234 ceramic superconductors. The values of the exponents are estimated to be q=3/2 and n=1. And the comparison of our description with YBCO single crystal also sounds excellent.