Higher Harmonics of Single-Crystal YBa2Cu3Oy Thin Films and Bulk Samples
The measurement of complex susceptibility χ = χ′ − iχ″ in a weak ac magnetic field, is one of the more useful methods for the study of magnetic response of superconductors.1–4 For sintered high-T c superconductors, χ generally involves two components, the intragrain bulk component and the intergrain coupling component. These two components can typically be specified by changing the amplitude of the ac measuring field. The intragrain bulk component is essentially insensitive to the change in the field amplitude H ac, while the coupling component is sensitive to changes in |H ac| as small as 10−4 mT.5
KeywordsCritical Current Density YBCO Thin Film Bean Model Flux Penetration Lower Critical Field
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