Recent developments in the characterization of superconducting films by microwaves

Abstract

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.

Invited contribution to EUCAS2001, accepted for publication in Physica C in its present form

References in corpus (5)

• Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2
• Significant Reduction of the Microwave Surface Resistance of MgB2 Films by Surface Ion Milling
• Nonlinear Dielectric Microwave Losses in MgO Substrates
• A Transport and Microwave Study of Superconducting and Magnetic RuSr2EuCu2O8
• Microwave properties of superconducting $Mg{B}_2$

Cited by in corpus (4)

• Energy gap, penetration depth and surface resistance of MgB2 thin films determined by microwave resonator mesurements
• Effects of the Two- Gap Nature on the Microwave Conductivity of 39 K Polycrystalline MgB2 Films
• Microwave performance of high-density bulk MgB2
• Nonlinearities in Microwave Superconductivity