The universal sealing law in magnetic phase diagram of high temperature superconductors

An empirical scaling law gamma(2)B = F(T/T-c) is proposed to successfully describe the three phase boundary lines; flux lattice melting, decoupling, and Irreversibility lines in the magnetic phase diagram of the high temperature superconductors. The characteristic field of the three boundary lines changes by orders of magnitude depending upon the material system; YBCO, LSCO and Bi2212. However, it was found that all the three lines could be scaled by a single material parameter, the electromagnetic anisotropy factor gamma(2) of each material. It is proposed that the three phase boundaries can be predicted for any HTSC system provided that its anisotropy factor is given.