Scaling of ac Susceptibility and Nonlinear Response in High-temperature   Superconductors
  The magnetic ac susceptibility of high-temperature superconductors is shown to obey some scaling relations.We try to ananlyse this behavior within the framework of a common nonlinear response function of mixed state.The derived equations for critical current and ac susceptibility (x(T)) agree with the scaling relations of experimental data. 
K. X. Chen, Z. H. Ning, H. Y. Xu, Z. Qi, G. Lu, F. R. Wang, D. L. Yin