Low Temperature Physics: 46, 338 (2020); https://doi.org/10.1063/10.0000864
Fizika Nizkikh Temperatur: Volume 46, Number 4 (April 2020), p. 410-415    ( to contents , go back )

Misorientation angle dependence of the critical current in HTS bicrystals with low-angle [001]-tilt grain boundaries

A.L. Kasatkin and V.P. Tsvetkovskii

G.V. Kurdyumov Institute of Metal Physics, National Academy of Sciences of Ukraine 36 Vernadsky Str., Kiev 03142, Ukraine
E-mail: al_kas@i.ua
pos Анотація:

Received November 25, 2019, published online February 28, 2020

Abstract

Dependence of the critical current on the misorientation angle in high-temperature superconductor (HTS) [001]-tilt bicrystal is theoretically examined. It’s argued that in the case of relatively small values of the bicrystal misorientation angle θ (θ ≤ 10–15°) the critical current as well as the resistive state emergence are determined by depinning of Abrikosov vortices, which are locked by c-oriented edge dislocations which form the low-angle [001]-tilt grain boundary and are aligned in a linear row along it. Dependence of the depinning critical current on the misorientation angle of bicrystal is calculated for this case and it reveals a good agreement with experimental data obtained on HTS bicrystals with low-angle [001]-tilt grain boundaries.

Key words: superconductor, bicrystal, grain boundary, Abrikosov vortex, dislocation, pinning, critical current.

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