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Effect of Twin Structure on Strain Dependences of Critical Current

Published online by Cambridge University Press:  15 February 2013

Alexey V. Semenov ,
Constantin G. Tretiatchenko ,
Vassily L. Svetchnikov ,
Volodymyr M. Pan  and
Harold Wiesmann
Alexey V. Semenov
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kyiv 03142, Ukraine Institute of Physics, 46 Nauki Avenue, Kyiv 03028, Ukraine
Constantin G. Tretiatchenko
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kyiv 03142, Ukraine
Vassily L. Svetchnikov
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kyiv 03142, Ukraine
Volodymyr M. Pan
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kyiv 03142, Ukraine
Harold Wiesmann
Affiliation:
Brookhaven National Laboratory, 76 Cornell Avenue, Upton, NY 11973, U.S.A.
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Abstract

We suggest a model explaining nonlinear dependences of critical current Jc in YBCO epitaxial films. Two features of YBCO are taken into account: twin domain structure in orthorhombic phase and the anisotropy of uniaxial strain dependence of Tc. Applied strain changes elementary pinning force of the defects located at low-angle dislocation boundaries between differently oriented twin domains. Account of Tc dependence on strain this leads to approximately parabolic strain behavior of Jc. We have obtained analytical expressions for the “initial strain”, which actually describes a natural misbalance between numbers of grain boundaries separating a and b oriented domains, as well as for “strain sensitivity”, which is determined by Tc dependence on uniaxial a and b strains and by the effective redistribution of vortices. Other experimentally observed effects, such as temperature, magnetic field and two-peak strain dependences of Jc, are shown to be described in the framework of suggested model.

Keywords

electrical propertiessuperconductingthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1434: Symposium I – Recent Advances in Superconductors, Novel Compounds and High-Tc Materials , 2013 , mrss12-1434-i06-06
Copyright
Copyright © Materials Research Society 2012

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References

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