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Magnetoconductance and photoresponse properties of disordered NbTiN films

Sidorova, Mariia and Semenov, Alexey and Hübers, Heinz-Wilhelm and S, Gyger and S, Steinhauer and Xiaofu, Zhang and Andreas, Schilling (2021) Magnetoconductance and photoresponse properties of disordered NbTiN films. Physical Review B, 104 (184514), pp. 1-10. American Physical Society. doi: 10.1103/PhysRevB.104.184514. ISSN 2469-9950.

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Official URL: https://link.aps.org/doi/10.1103/PhysRevB.104.184514


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 qT le 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/τe-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/τe-ph ∝ 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.

Item URL in elib:https://elib.dlr.de/146601/
Document Type:Article
Title:Magnetoconductance and photoresponse properties of disordered NbTiN films
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
S, GygerKTH Royal Institute of Technology, Stockholm, SwedenUNSPECIFIEDUNSPECIFIED
S, SteinhauerKTH Royal Institute of Technology, Stockholm, SwedenUNSPECIFIEDUNSPECIFIED
Xiaofu, ZhangPhysics Institute, University of Zürich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Andreas, SchillingPhysics Institute, University of Zürich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Date:22 November 2021
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:pp. 1-10
Publisher:American Physical Society
Keywords:elctron-phonon interaction, disordered films, magnetoconductance
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
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:02 Dec 2021 10:17
Last Modified:02 Dec 2021 10:17

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