A SCALING PROPERTY IN THE REVERSIBLE MAGNETIZATION OF ANISOTROPIC HIGH-KAPPA TYPE-II SUPERCONDUCTORS

We find that the reversible magnetization M of an anisotropic high-kappa type-II superconductor can be written to good approximation as -4-pi-M = (H(c)2/H(c2)) PHI (h) for the applied field H >> H(c1), where h = H/H(c2) is the reduced field and PHI is a function of h. For the high-temperature superconductors, this property gives the relation M parallel-to c(H) = gamma-M parallel-to ab(gamma-H), where M parallel-to i is the magnetization for H parallel to the i direction and gamma = H(c2 parallel-to ab)/H(c2 parallel-to c) is the anisotropy ratio. It provides a simple way to estimate gamma from the reversible magnetization measurement, and we find gamma congruent-to 18 as a lower bound for a Bi2Sr2CaCu2O8 single crystal.