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Interface control in all metalorganic deposited coated conductors: Influence on critical currents

Published online by Cambridge University Press:  03 March 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—Consejo Superior de Investigaciones Cientificas (ICMAB-CSIC), Campus de la U.A.B., 08193 Bellaterra, Spain
Mariona Coll
Affiliation:
Institut de Ciència de Materials de Barcelona—Consejo Superior de Investigaciones Cientificas (ICMAB-CSIC), Campus de la U.A.B., 08193 Bellaterra, Spain
Andrea Cavallaro
Affiliation:
Institut de Ciència de Materials de Barcelona—Consejo Superior de Investigaciones Cientificas (ICMAB-CSIC), Campus de la U.A.B., 08193 Bellaterra, Spain
Jaume Gàzquez
Affiliation:
Institut de Ciència de Materials de Barcelona—Consejo Superior de Investigaciones Cientificas (ICMAB-CSIC), Campus de la U.A.B., 08193 Bellaterra, Spain
Narcis Mestres
Affiliation:
Institut de Ciència de Materials de Barcelona—Consejo Superior de Investigaciones Cientificas (ICMAB-CSIC), Campus de la U.A.B., 08193 Bellaterra, Spain
Felip Sandiumenge
Affiliation:
Institut de Ciència de Materials de Barcelona—Consejo Superior de Investigaciones Cientificas (ICMAB-CSIC), Campus de la U.A.B., 08193 Bellaterra, Spain
Teresa Puig
Affiliation:
Institut de Ciència de Materials de Barcelona—Consejo Superior de Investigaciones Cientificas (ICMAB-CSIC), Campus de la U.A.B., 08193 Bellaterra, Spain
Xavier Obradors
Affiliation:
Institut de Ciència de Materials de Barcelona—Consejo Superior de Investigaciones Cientificas (ICMAB-CSIC), Campus de la U.A.B., 08193 Bellaterra, Spain
*
a) Address all correspondence to this author. e-mail: apomar@icmab.es This paper was selected as the Outstanding Meeting Paper for the 2005 MRS Spring Meeting Symposium C Proceedings, Vol. 868E.
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Abstract

In this work, we report recent progress in the control of the interface quality between buffer layers and YBa2Cu3O7 (YBCO) thin films grown by the trifluoroacetates route (TFA) and how it influences the critical current Jc of the coated conductors (CCs). We have mainly focused on the two most used cap layers, i.e., CeO2 and SrTiO3. We show that for CeO2 buffer layers, the key for high-quality YBCO epitaxy is to obtain atomically flat (001) terraced CeO2 surfaces. CC YBCOTFA/CeO2sputt/YSZ/CeO2/Ni with Jc (77 K) ∼ 1 MA/cm2 and chemical CC YBCOTFA/CeO2MOD/y-stabilized zirconia and ion beam assisted deposition (YSZIBAD)/stainless steel (SS) with Jc (60 K)=2.3MA/cm2 were obtained. For metalorganic deposited (MOD) SrTiO3 the main issue is to reduce the overall surface roughness that tends to increase film porosity due to an enhanced {100} YBCO nucleation. Improved roughness can be achieved by growing the buffer layers at lower temperatures. An all-chemical CC, YBCOTFA/SrTiO3MOD/BaZrO3MOD/NiO–SOE/Ni, with promising in-plane texture, ΔϕYBCO = 6.6° was grown.

Keywords

Metalorganic depositionSuperconducting
Type
Outstanding Meeting Papers
Information
Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2176 - 2184
Copyright
Copyright © Materials Research Society 2006

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References

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