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BYZO Nanopancakes in HTS YBa2Cu3O7-δ Films: Effect on Critical Current Density and Nonlinear Microwave Response

Published online by Cambridge University Press:  12 October 2011

Victor S. Flis ,
Vassily L. Svetchnikov ,
Oleksa A. Kalenyuk ,
Alexander L. Kasatkin ,
Viacheslav O. Moskaliuk ,
Andrey I. Rebikov ,
Constantin G. Tretiatchenko  and
Volodymyr M. Pan
Victor S. Flis
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kiev, 03142, Ukraine
Vassily L. Svetchnikov
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kiev, 03142, Ukraine
Oleksa A. Kalenyuk
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kiev, 03142, Ukraine
Alexander L. Kasatkin
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kiev, 03142, Ukraine
Viacheslav O. Moskaliuk
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kiev, 03142, Ukraine
Andrey I. Rebikov
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kiev, 03142, Ukraine
Constantin G. Tretiatchenko
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kiev, 03142, Ukraine
Volodymyr M. Pan
Affiliation:
G. V. Kurdyumov Institute for Metal Physics, 36 Vernadsky Blvd., Kiev, 03142, Ukraine
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Abstract

We have studied nanostructure, electric transport and microwave properties of HTS YBa2Cu3O7-δ films prepared by PLD on LaAlO3 single crystal substrates using targets doped with BaZrO3. Two essentially different types of nanoparticles are revealed by HREM: “nanopancakes” and “nanorods”. Tiny nanopancakes are 1-4 nm in ab-plane and only few atomic layers thick. Nanopancakes are surrounded with deformed area and numerous dislocations. Such nanoparticles seem to be responsible for jc enhancement. Nanopancakes evolve to much wider and longer nanorods at higher substrate temperatures and/or slower deposition. There are no dislocations around nanorods. Elastic strains are avoided due to slight inclination of the c-axis. Dislocations around nanopancakes are suggested to be additional flux pinning centers and retard thermally activated relaxation of the dislocation nanostructure.

Keywords

superconductingnanostructuredislocations
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1367: Symposium VV – Future Directions in High-Temperature Superconductivity—New Materials and Applications , 2011 , mrss11-1367-vv08-06
Copyright
Copyright © Materials Research Society 2011

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