Microwave surface resistance in superconductors with grain boundaries

Yasunori Mawatari

Microwave surface resistance in superconductors with grain boundaries

Superconductivity 2007-05-23 v1

Authors: 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 $R_s$ 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.

Keywords

microwave surface resistance grain boundaries two-fluid model Josephson junction surface impedance

Cite

@article{arxiv.cond-mat/0501225,
  title  = {Microwave surface resistance in superconductors with grain boundaries},
  author = {Yasunori Mawatari},
  journal= {arXiv preprint arXiv:cond-mat/0501225},
  year   = {2007}
}

Comments

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

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