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All-chemical high-Jc YBa2Cu3O7 multilayers with SrTiO3 as cap layer

Published online by Cambridge University Press:  01 May 2006

A. Pomar ,
M. Coll ,
A. Cavallaro ,
J. Gàzquez ,
J.C. González ,
N. Mestres ,
F. Sandiumenge ,
T. Puig  and
X. Obradors
A. Pomar*
Affiliation:
Institut de Ciència de Materials de Barcelona–CSIC, Campus de la UAB, 08193 Bellaterra, Spain
M. Coll
Affiliation:
Institut de Ciència de Materials de Barcelona–CSIC, Campus de la UAB, 08193 Bellaterra, Spain
A. Cavallaro
Affiliation:
Institut de Ciència de Materials de Barcelona–CSIC, Campus de la UAB, 08193 Bellaterra, Spain
J. Gàzquez
Affiliation:
Institut de Ciència de Materials de Barcelona–CSIC, Campus de la UAB, 08193 Bellaterra, Spain
J.C. González
Affiliation:
Institut de Ciència de Materials de Barcelona–CSIC, Campus de la UAB, 08193 Bellaterra, Spain
N. Mestres
Affiliation:
Institut de Ciència de Materials de Barcelona–CSIC, Campus de la UAB, 08193 Bellaterra, Spain
F. Sandiumenge
Affiliation:
Institut de Ciència de Materials de Barcelona–CSIC, Campus de la UAB, 08193 Bellaterra, Spain
T. Puig
Affiliation:
Institut de Ciència de Materials de Barcelona–CSIC, Campus de la UAB, 08193 Bellaterra, Spain
X. Obradors
Affiliation:
Institut de Ciència de Materials de Barcelona–CSIC, Campus de la UAB, 08193 Bellaterra, Spain
*
a) Address all correspondence to this author. e-mail: apomar@icmab.es
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Abstract

We grew high-quality epitaxial YBa2Cu3O7 (YBCO) superconducting thin films by the trifluoroacetate route on top of chemical solution deposited SrTiO3 buffer layers. We show that high lattice mismatches can be accommodated in heterostructures grown by chemical methods. Clean interfaces were observed between the different layers. The influence of the buffer layer growth conditions on the final superconducting properties was studied in depth. We have proved that the main parameter affecting the YBCO critical currents is the SrTiO3 surface roughness, which promotes the nucleation of a/b axis grains and, as a consequence, the porosity of the YBCO film. On the other hand, an improved dependence of the critical current with perpendicular applied magnetic field was observed. This suggests a strengthened vortex pinning due to a higher density of a/b axis oriented grains.

Keywords

Electrical propertiesMicrostructureSuperconducting
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 5 , May 2006 , pp. 1106 - 1116
Copyright
Copyright © Materials Research Society 2006

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