Flux flow velocity instability and quasiparticle relaxation time in nanocrystalline beta-W thin films

J. A. HOFER; N. HABERKORN

THIN SOLID FILMS

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2021 vol. 730 p. 138690 - 138696

0040-6090

We characterized the superconducting properties of a micropatterned 23 nm thick -W film using electrical transport measurements in magnetic fields. The film is nanocrystalline and displays a smooth surface. The superconducting critical temperature is 4.6 K. The critical current densities display a fast drop with the magnetic field, indicating weak vortex pinning. From the analysis of the instability in the vortex motion at low magnetic fields in the flux-flow state, we observe vortex velocities up 800 m/s. An inelastic lifetime of quasiparticles around 0.6 ns is estimated at low temperatures. Together with high uniformity in thickness and simplicity in the fabrication process, the superconducting properties make -W films promising for applications in fast single-photon detectors.