High-Frequency Electrodynamics of Nanostructured High-TcSuperconductor Films

Theoretical model for microwave response of nanostructured high-T
c
superconductor (HTS) film, with implanted nanoparticles of dielectric material in the films interior, is developed and the microwave surface resistance R
s
(T, H, ω) is calculated both for the Meissner and mixed states of superconductor film in applied dc magnetic field. Obtained results indicate that implantation of dielectric nanoparticles or point-like radiation defects can significantly improve superconductor characteristics at microwave frequencies. Namely, these implanted nanoparticles can decrease the surface resistance in the Meissner state and eliminate Abrikosov vortices oscillations and related microwave energy losses in the mixes state of the film, thus decreasing the Abrikosov vortices contribution to the R
s
value in the mixed state of HTS film.