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

被引：2

作者：

Vasyutin, M. A. ^{[1
]}

Kuz'michev, N. D. ^{[1
]}

Shilkin, D. A. ^{[1
]}

机构：

[1] Mordovian NP Ogarev State Univ, Saransk 430005, Russia

来源：

PHYSICS OF METALS AND METALLOGRAPHY | 2020年 / 121卷 / 10期

关键词：

superconducting NbN films; current– voltage characteristics; collective pinning; magnetic flux flow; Larkin– Ovchinnikov instability;

D O I：

10.1134/S0031918X20090094

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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.

引用

页码：955 / 960

页数：6

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