Microwave surface resistance in superconductors with grain boundaries

Details Microwave surface resistance in superconductors with grain boundaries Microwave surface resistance in superconductors with grain boundaries

2005-01-11

arxiv.org/abs/cond-mat/0501225v1

Physics

Condensed Matter

Superconductivity

6 pages, 1 figure, accepted for publication in Phys. Rev. B

Scientific paper

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 $R_s$ nonmonotonically depends on the critical current density $J_{cj}$ at GB junctions, and $R_s$ for superconductors with GBs can be smaller than the surface resistance $R_{s0}$ for ideal homogeneous superconductors without GBs.

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