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Examines AC susceptibility in YBCO materials under varying oxygen and hydrogen loads, suggesting insights into flux pinning mechanisms.
The complex AC susceptibility of high Tc superconducting materials (χ_n=χ^'_n+χ^''_n) has been described in terms of the first seven harmonic component of Fourier series. Has been measured the χ^'_n and χ^''_n (n=1,7) of sintered YBa2 Cu3O7-x (YBCO) bulk oxygen and hydrogen loaded samples versus amplitude and frequency of AC magnetic field at fixed temperature. The samples have been loaded by ms current pulses electrolysis in an aqueous solution (0.3N LiOH+H2O) at room temperature. In addition to the simplicity of the experimental setup, this procedure allows to obtain extremely high equivalent hydrogen/oxygen gas pressure on the surface of the electrodes. The YBCO electrode is polarized by short pulse width (0.5-10ms) and high power (120 W) peaks with a variable repetition rate (0.1-10000 Hz). The pulses are obtained by an home-made pulse generator. The differences in the behaviour of the susceptibilities harmonic component between the deficiency and oxygen or hydrogen loaded samples give us the possibility to connect the susceptibilities with variations of the flux pinning in respect to normal losses in the superconducting materials. The loading can be a good probe to have information on the mechanism of the processes that sustain the critical current density Jc in this situation these effects appear strongly dependent on the loading condition. By comparison of this measurements has been observed drastic change in behaviour of susceptibility.
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F. et al. (1996) studied this question.
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