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Interface Control in All MOD Coated Conductors: Influence on Critical Currents

Published online by Cambridge University Press:  01 February 2011

Alberto Pomar ,
Mariona Coll ,
Andrea Cavallaro ,
Jaume Gàzquez ,
Narcis Mestres ,
Felip Sandiumenge ,
Teresa Puig  and
Xavier Obradors
Alberto Pomar
Affiliation:
Institut de Ciència de Materials de Barcelona, CSIC, Campus de la U.A.B., 08193 Bellaterra,Spain
Mariona Coll
Affiliation:
Institut de Ciència de Materials de Barcelona, CSIC, Campus de la U.A.B., 08193 Bellaterra,Spain
Andrea Cavallaro
Affiliation:
Institut de Ciència de Materials de Barcelona, CSIC, Campus de la U.A.B., 08193 Bellaterra,Spain
Jaume Gàzquez
Affiliation:
Institut de Ciència de Materials de Barcelona, CSIC, Campus de la U.A.B., 08193 Bellaterra,Spain
Narcis Mestres
Affiliation:
Institut de Ciència de Materials de Barcelona, CSIC, Campus de la U.A.B., 08193 Bellaterra,Spain
Felip Sandiumenge
Affiliation:
Institut de Ciència de Materials de Barcelona, CSIC, Campus de la U.A.B., 08193 Bellaterra,Spain
Teresa Puig
Affiliation:
Institut de Ciència de Materials de Barcelona, CSIC, Campus de la U.A.B., 08193 Bellaterra,Spain
Xavier Obradors
Affiliation:
Institut de Ciència de Materials de Barcelona, CSIC, Campus de la U.A.B., 08193 Bellaterra,Spain
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Abstract

In this work we will report our recent progress in the control of the interface quality between buffer layers and YBCO thin films grown by the trifluoroacetates route (TFA) and how it influences the critical current of the coated conductors. We have mainly focused on vacuum and metalorganic deposited (MOD) fluorite-like CeO2 buffer layers and on MOD perovskite SrTiO3 buffer layers. We will show that for vacuum CeO2 buffer layers, microcracks at the surface can be controlled by the means of thermal treatments. Coated conductors TFA-YBCO/CeO2sputt/YSZ/CeO2/Ni with Jc(77K)˜1MA/cm2 can be grown even in the presence of these microcracks. For MOD SrTiO3 we will show that growing the buffer layer at low temperature reduces surface roughness and multilayers with high critical currents can be achieved. An all-chemical coated conductor has been grown TFA-YBCO/SrTiO3MOD/BaZrO3MOD/NiO-SOE/Ni with promising in-plane texture, Δ φYBCO=6.6°. For MOD CeO2 buffer layers, thermal annealings in oxidizing atmospheres lead to atomically flat surfaces that avoid the typical polycrystalline surfaces observed in MOD CeO2 grown in Ar/H2. High Jc multilayers can be achieved and the first all chemical coated conductor in IBAD tapes TFA-YBCO/CeO2MOD/YSZIBAD/SS has been obtained with Jc(60K)=2.3MA/cm2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 868: Symposium C – Recent Advances in Superconductivity - Materials Synthesis, Multiscale Characterization and Functionally Layered Composite Conductors , 2005 , C6.6
Copyright
Copyright © Materials Research Society 2005

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