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Magnetoconductance and photoresponse properties of disordered NbTiN films
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- Sidorova, M. (author)
- Humboldt Univ, Dept Phys, Newtonstr 15, D-12489 Berlin, Germany.;German Aerosp Ctr, Inst Opt Sensor Syst, Rutherfordstr 2, D-12489 Berlin, Germany.
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- Semenov, A. D. (author)
- German Aerosp Ctr, Inst Opt Sensor Syst, Rutherfordstr 2, D-12489 Berlin, Germany.
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- Huebers, H-W (author)
- Humboldt Univ, Dept Phys, Newtonstr 15, D-12489 Berlin, Germany.;German Aerosp Ctr, Inst Opt Sensor Syst, Rutherfordstr 2, D-12489 Berlin, Germany.
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- Humboldt Univ, Dept Phys, Newtonstr 15, D-12489 Berlin, Germany;German Aerosp Ctr, Inst Opt Sensor Syst, Rutherfordstr 2, D-12489 Berlin, Germany. German Aerosp Ctr, Inst Opt Sensor Syst, Rutherfordstr 2, D-12489 Berlin, Germany. (creator_code:org_t)
- American Physical Society (APS), 2021
- 2021
- English.
- In: Physical Review B. - : American Physical Society (APS). - 2469-9950 .- 2469-9969. ; 104:18
- Journal article (peer-reviewed)
Abstract
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- We report on the experimental study of phonon properties and electron-phonon scattering in thin superconducting NbTiN films, which are intensively exploited in various applications. Studied NbTiN films with sub-10-nm thicknesses are disordered with respect to electron transport, the Ioffe-Regel parameter of kFle = 2.5-3.0 (kF is the Fermi wave vector, and le is the electron mean free path), the inelastic electron-phonon interaction, and the product qTle << 1 (qT is the wave vector of a thermal phonon). By means of magnetoconductance and photoresponse techniques, we derive the inelastic electron-phonon scattering rate 1/tau e-ph and determine sound velocities and phonon heat capacities. In the temperature range from 12 to 20 K, the scattering rate varies with temperature as 1/tau e-ph proportional to T 3.45 +/- 0.05; its value extrapolated to 10 K amounts to approximately 1/16 ps. Making a comparative analysis of our films and other films used in superconducting devices, such as polycrystalline granular NbN and amorphous WSi, we find a systematic reduction of the sound velocity in all these films by about 50% compared to the corresponding bulk crystalline materials. A corresponding increase in the phonon heat capacities in all these films is, however, less than the Debye model predicts. We attribute these findings to reduced film dimensionality and film morphology.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- Sidorova, M.
- Semenov, A. D.
- Huebers, H-W
- Gyger, Samuel
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- Zhang, X.
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- Schilling, A.
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