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Physics of Metals and Metallography
Erschienen in: Physics of Metals and Metallography 10/2020

01.10.2020 | ELECTRICAL AND MAGNETIC PROPERTIES

Specificities of Current–Voltage Characteristics of NbN Superconducting Films in a Magnetic Field

verfasst von: M. A. Vasyutin, N. D. Kuz’michev, D. A. Shilkin

Erschienen in: Physics of Metals and Metallography | Ausgabe 10/2020

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Abstract

The current–voltage characteristics (CVCs) of wide superconducting NbN films in magnetic fields up to 8 T are studied in this work. Linear portions that do not change the tilt angle in magnetic fields below the superconducting transition temperature have been found in the CVCs of such films. A model of viscous magnetic flux under conditions of rigid fixation of a part of the vortex system is proposed to explain these linear portions. The magnetic field dependences of the depinning current and the vortex motion velocity are found within the model of collective pinning of the vortex lattice. The value of the disorder parameter is obtained, and the depairing current density is estimated. From the Larkin–Ovchinnikov theory of vortex lattice instability, the dependence of the energy relaxation time of quasiparticles on the magnetic field is determined.
Vorheriger Artikel Magnetic Properties and High-Frequency Impedance of Nanocrystalline FeSiBNbCu Ribbons in a 300 to 723 K Temperature Range
Nächster Artikel Structure, Magnetic Properties and Magnetic Impedance of Fast Quenched Ribbons of Alloys Based on FINEMET in the Initial State and After Heat Treatment

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Metadaten
Titel
Specificities of Current–Voltage Characteristics of NbN Superconducting Films in a Magnetic Field
verfasst von
M. A. Vasyutin
N. D. Kuz’michev
D. A. Shilkin
Publikationsdatum
01.10.2020
Verlag
Pleiades Publishing
Erschienen in
Physics of Metals and Metallography / Ausgabe 10/2020
Print ISSN: 0031-918X
Elektronische ISSN: 1555-6190
DOI
https://doi.org/10.1134/S0031918X20090094

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