Physics – Condensed Matter – Superconductivity
Scientific paper
2001-11-21
Physica C 372-376, pp. 571-577 (2002)
Physics
Condensed Matter
Superconductivity
Invited contribution to EUCAS2001, accepted for publication in Physica C in its present form
Scientific paper
We describe and analyze selected surface impedance data recently obtained by different groups on cuprate, ruthenate and diboride superconducting films on metallic and dielectric substrates for fundamental studies and microwave applications. The discussion includes a first review of microwave data on MgB2, the weak-link behaviour of RABiTS-type YBa2Cu3O7-d tapes, and the observation of a strong anomalous power-dependence of the microwave losses in MgO at low temperatures. We demonstrate how microwave measurements can be used to investigate electronic, magnetic, and dielectric dissipation and relaxation in the films and substrates. The impact of such studies reaches from the extraction of microscopic information to the engineering of materials and further on to applications in power systems and communication technology.
Getta M.
Hein Matthias A.
Hirst P. J.
Humphreys Richard G.
Kreiskott S.
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