Microwave surface resistance in superconductors with grain boundaries
Yasunori Mawatari
Abstract
Microwave-field distribution, dissipation, and surface impedance are theoretically investigated for superconductors with laminar grain boundaries (GBs). In the present theory we adopt the two-fluid model for intragrain transport current in the grains, and the Josephson-junction model for intergrain tunneling current across GBs. Results show that the surface resistance Rs nonmonotonically depends on the critical current density Jcj at GB junctions, and Rs for superconductors with GBs can be smaller than the surface resistance Rs0 for ideal homogeneous superconductors without GBs.
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