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Author (up) Hofer, J.A.; Haberkorn, N. url  doi
  Title Flux flow velocity instability and quasiparticle relaxation time in nanocrystalline β-W thin films Type Journal Article
  Year 2021 Publication Thin Solid Films Abbreviated Journal Thin Solid Films  
  Volume 730 Issue Pages 138690  
  Keywords Thin films; Electrical transport; Vortex velocities  
  Abstract We characterized the superconducting properties of a micropatterned 23 nm thick β-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 β-W films promising for applications in fast single-photon detectors.  
  Corporate Author Thesis  
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  Series Volume Series Issue Edition  
  ISSN 0040-6090 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 870  
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