Abstract
The microwave properties of three different (RE)BaCuO superconductor samples (RE = rare earth) are investigated by measuring surface impedance so as to identify the conduction mechanism involved. Although all these samples (bulk and thin film, laser ablated and co-evaporated) demonstrate similar low surface resistance (10 to 100 mω at 77K and 20 GHz) it is shown, from surface impedance measurements vs frequency and temperature, that the conduction mechanisms involved vary greatly according to the sample considered; an interpretation is proposed based on the relative value of the penetration depth and the normal skin depth.
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