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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 J c, are shown to be described in the framework of suggested model.

Keywords

electrical propertiessuperconductingthin film

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References

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