Superconductivity and localization in thin polycrystalline tungsten-germanium films
S. J. M. Bakker, H. M. Jaeger, T. M. Klapwijk, E. van der Drift, S. Radelaar
DOI 10.1103/PhysRevB.48.4168 · Physical Review B
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Abstract
We report magnetoresistance measurements on a high-resistivity (≊200 μΩ cm) crystalline material that becomes superconducting. Our samples are thin polycrystalline W100−xGex (x=16–18) films, measured above the superconducting transition temperature. This is an opportunity to test the predictions for electron-phonon scattering in the presence of strong elastic scattering. The films are deposited using a low-temperature chemical-vapor-deposition process and show the crystalline β-W structure (A15) with a Tc of around 3 K and Hc2 near 8 T. Contributions from both superconducting fluctuations and weak localization to the magnetoresistance are discussed and the inelastic-scattering rate is found to be determined by electron-phonon scattering.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| W100-xGex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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