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Electron energy relaxation in disordered superconducting NbN films

Sidorova, Mariia and Semenov, Alexey and Huebers, H.-W. and Ilin, K. and Siegel, M. and Charaev, Ilya and Moshkova, Maria and Kaurova, Natalia and Goltsman, G. and Zhang, Xiaofu and Schilling, Andreas (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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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 qT l (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 ∼ T^n 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/141287/
Document Type:Article
Title:Electron energy relaxation in disordered superconducting NbN films
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ilin, K.Institut für Mikro- und Nanoelektronische Systeme (IMS), Karlsruher Institut für Technolgie (KIT), Hertzstrasse 16, 76187 Karlsruhe, GermanyUNSPECIFIEDUNSPECIFIED
Siegel, M.Institute of Micro- and Nanoelectronic Systems, University KarlsruheUNSPECIFIEDUNSPECIFIED
Charaev, Ilyauniversity of karlsruheUNSPECIFIEDUNSPECIFIED
Moshkova, MariaStaatliche Pädagogische Universität Moskau/RusslandUNSPECIFIEDUNSPECIFIED
Kaurova, NataliaStaatliche Pädagogische Universität Moskau/RusslandUNSPECIFIEDUNSPECIFIED
Goltsman, G.Staatliche Pädagogische Universität Moskau/RusslandUNSPECIFIEDUNSPECIFIED
Zhang, XiaofuUniversität ZürichUNSPECIFIEDUNSPECIFIED
Schilling, AndreasUniversity of ZürichUNSPECIFIEDUNSPECIFIED
Date:3 August 2020
Journal or Publication Title:Physical Review B
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:054501
Publisher:American Physical Society
Keywords:electron-phonon interaction, disordered superconductors
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Detectors for optical instruments (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:15 Mar 2021 14:10
Last Modified:24 Oct 2023 11:52

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