Abstract
The complex susceptibility of high Tc superconductor YBa2Cu3O7–δ is measured as a function of temperature, for different values of ac field amplitude and dc field. The measurements are carried out on ceramic and powdered samples. Moreover, the dependences of lower critical fields upon the temperature measured by the dc susceptometer are presented. It is concluded that the best description of experimental data gives the weak link model, which also predicts a spin glass like behaviour. [Russian Text Ignore]
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