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At nonzero frequencies both the normal and superfluid fractions, as well as moving vortices, contribute to the electrical transport, resulting in intricate expressions for the resistivity. We present an extended study of microwave resistivity data measured on YBa_2Cu_3O_{7-δ}, SmBa_2 Cu_3O_{7-δ}, and MgB_2 by means of a broad-band technique between 2 and 20 GHz and of a resonant system at 50 GHz....
A set of oxygen deficient powder and granular samples of YBa_2Cu_3O_{7-δ} ceramics was studied by means of thermogravimetric and magnetically modulated microwave absorption methods. Especially the last method has turned out to be a powerful method, which was used to determine the dependence of critical temperature T_c on the oxygen parameterδ. Using these methods it has been shown that the removing...
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