Flux flow velocity instability and quasiparticle relaxation time in nanocrystalline β-W thin films
| Autor: | Nestor Fabian Haberkorn, J.A. Hofer |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Condensed matter physics Drop (liquid) Metals and Alloys 02 engineering and technology Surfaces and Interfaces 021001 nanoscience & nanotechnology 01 natural sciences Instability Nanocrystalline material Surfaces Coatings and Films Electronic Optical and Magnetic Materials Vortex Magnetic field Condensed Matter::Superconductivity 0103 physical sciences Materials Chemistry Quasiparticle Thin film 0210 nano-technology |
| Zdroj: | Thin Solid Films. 730:138690 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2021.138690 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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