Flux-Flow Conductivity in Anisotropic and Layered High- T c Superconductors

The angular dependence of the flux-flow conductivity, σ f (Θ), for an anisotropic uniaxial superconductor is calculated for low, H c1 (Θ) ≪ B ≪ H c2 (Θ), and high, B → H c2 , magnetic fields using the time-dependent Ginzburg-Landau theory. We consider also σ f (Θ) for highly layered superconductors. The relevance of our results to measurements of H c2 (Θ) is discussed.