Issues

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1984

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March

  

Reviews of topical problems


Theory of current states in narrow superconducting channels

The properties of narrow superconducting channels carrying a direct current are reviewed. Among the topics covered are the stability of the normal state of the current-carrying channel and the mechanism for a transition from this normal state to the superconducting state. In a homogeneous channel, the transition occurs through the formation of a critical nucleus and is a first-order phase transition. In a channel with inhomogeneities, the transition is quite different. In this case the normal state can exist only down to a certain value of the current, below which the normal state is absolutely unstable. The review is devoted primarily to the theory of the resistive state of narrow channels, which exists at currents above the critical Ginzburg--Landau current. The description is based on the concept of phase-slippage centers. Phenomenological models are discussed, as is a model of a fluctuational excitation of phase-slippage centers. The results obtained from the microscopic dynamic theory of superconductivity are discussed at length. Among these results are the voltage-current characteristic of the resistive state, the abrupt change in the voltage on this characteristic, and the structure of the phase-slippage centers.

PACS: 74.25.Fy, 74.20.De, 74.40.+k, 74.25.Dw (all)
DOI: 10.1070/PU1984v027n03ABEH004037
URL: https://ufn.ru/en/articles/1984/3/c/
Citation: Ivlev B I, Kopnin N B "Theory of current states in narrow superconducting channels" Sov. Phys. Usp. 27 206–227 (1984)
BibTexBibNote ® (generic)BibNote ® (RIS) MedlineRefWorks
PT Journal Article
TI Theory of current states in narrow superconducting channels
AU Ivlev B I
FAU Ivlev BI
AU Kopnin N B
FAU Kopnin NB
DP 10 Mar, 1984
TA Phys. Usp.
VI 27
IP 3
PG 206-227
RX 10.1070/PU1984v027n03ABEH004037
URL https://ufn.ru/en/articles/1984/3/c/
SO Phys. Usp. 1984 Mar 10;27(3):206-227

Оригинал: Ивлев Б И, Копнин Н Б «Теория токовых состояний в узких сверхпроводящих каналах» УФН 142 435–471 (1984); DOI: 10.3367/UFNr.0142.198403c.0435

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