Microwave response of type-II superconductors at weak pinning

Abstract

Theory of linear microwave response of thin films of type-II superconductors in the mixed state is developed taking into account random spatial fluctuations of the parameters of the system, such as the order parameter, diffusion coefficient, or film thickness. In the regime of collective pinning the microwave response of the system exhibits strong frequency dispersion, arising from nonequilibrium vortex core quasiparticles. The corresponding contribution to the ac conductivity is controlled by the inelastic relaxation time, and may exceed the usual Bardeen-Stephen conductivity. It is caused by the Debye-type inelastic relaxation. Debye mechanism of microwave losses may be responsible for strong effects of electromagnetic noise upon dc conductivity in the mixed state at low temperatures.

5 pages

References in corpus (5)

• Magnetic field resilient high kinetic inductance superconducting niobium nitride coplanar waveguide resonators
• Magnetic field dependence of the internal quality factor and noise performance of lumped-element kinetic inductance detectors
• Giant microwave absorption in s- and d- wave superconductors
• Conductivity of superconductors in the flux flow regime
• Giant magnetoconductivity in non-centrosymmetric superconductors

Cited by in corpus (3)

• Near-power-law temperature dependence of the superfluid stiffness in strongly disordered superconductors
• Non-linear vortex dynamics in the mixed state of superconducting a-MoGe and NbN thin films using low-frequency two-coil mutual inductance technique
• Giant microwave absorption in the vortex lattice in $s$-wave superconductors