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Electron energy relaxation in disordered superconducting NbN films

Sidorova, Mariia and Semenov, Alexey and Hübers, Heinz-Wilhelm and Ilin, Konstantin and Siegel, M. and Charaev, Ilya and Moshkova, Maria and Kaurova, N. and Goltsman, G. and Zhang, Xiaofu and Schilling, A. (2020) Electron energy relaxation in disordered superconducting NbN films. Physical Review B, 102 (054501). American Physical Society. doi: 10.1103/PhysRevB.102.054501. ISSN 2469-9950.

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Official URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.054501


We report on the inelastic-scattering rate of electrons on phonons and relaxation of electron energy studied by means of magnetoconductance, and photoresponse, respectively, in a series of strongly disordered superconducting NbN films. The studied films with thicknesses in the range from 3 to 33 nm are characterized by different Ioffe-Regel parameters but an almost constant product qTl (qT is the wave vector of thermal phonons and l is the elastic mean free path of electrons). In the temperature range 14–30 K, the electron-phonon scattering rates obey temperature dependencies close to the power law 1/τe−ph∼Tn with the exponents n≈3.2–3.8. We found that in this temperature range τe−ph and n of studied films vary weakly with the thickness and square resistance. At 10 K electron-phonon scattering times are in the range 11.9–17.5 ps. The data extracted from magnetoconductance measurements were used to describe the experimental photoresponse with the two-temperature model. For thick films, the photoresponse is reasonably well described without fitting parameters, however, for thinner films, the fit requires a smaller heat capacity of phonons. We attribute this finding to the reduced density of phonon states in thin films at low temperatures. We also show that the estimated Debye temperature in the studied NbN films is noticeably smaller than in bulk material.

Item URL in elib:https://elib.dlr.de/141321/
Document Type:Article
Title:Electron energy relaxation in disordered superconducting NbN films
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ilin, KonstantinInstitute of Micro and Nanoelectronic Systems, University of KarlsruheUNSPECIFIEDUNSPECIFIED
Siegel, M.Institute of Micro- and Nano-Electronic Systems, University of KarlsruheUNSPECIFIEDUNSPECIFIED
Charaev, Ilyauniversity of karlsruheUNSPECIFIEDUNSPECIFIED
Moshkova, MariaStaatliche Pädagogische Universität, Moskau, RusslandUNSPECIFIEDUNSPECIFIED
Kaurova, N.Staatliche Pädagogische Universität, Moskau, RusslandUNSPECIFIEDUNSPECIFIED
Goltsman, G.Staatliche Pädagogische Universität Moskau/RusslandUNSPECIFIEDUNSPECIFIED
Zhang, XiaofuPhysics Institute, University of Zürich, Winterthurerstraße 190, 8057 Zürich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Schilling, A.Physics Institute, University of Zürich, Winterthurerstraße 190, 8057 Zürich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Date:August 2020
Journal or Publication Title:Physical Review B
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Physical Society
Keywords:electron relaxation, superconducting nanowire, electron dephasing, phonon softening
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignment
DLR - Program:no assignment
DLR - Research theme (Project):no assignment
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Sidorova, Mariia
Deposited On:15 Mar 2021 14:13
Last Modified:24 Oct 2023 11:52

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