In this work we report analysis of magnetization fluctuations for the CaLaBaCu3O7-δ superconducting system. We describe a procedure for extracting the penetration depth λ(T) and the coherence length ξ parameters from the magnetization, as a function of the applied magnetic field. This procedure takes the vortex fluctuation into account. The data of the magnetization excess ΔM(T) is analyzed for different values of temperature in the interval from 65 K to 73 K. For several magnetic fields we observed a crossover in the magnetization curves at the characteristic temperature value T*=72.2 K. We calculated the data of magnetization excess from curves of Magnetization as a function of logarithm of applied field. This procedure was performed for polycrystalline samples of CaLaBaCu3O7-δ by using the proposition of Bulaevskii, Ledvij and Kogan. We notice that the values for these superconducting parameters are in agreement with reports for high temperature superconductors. © 2007 Elsevier Science. All rights reserved |
