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Microstructural characterization of Yba2Cu3O7–δ thick films grown at very high rates and high temperatures by pulsed laser deposition

Published online by Cambridge University Press:  06 January 2012

A. Berenov ,
N. Malde ,
Y. Bugoslavsky ,
L. F. Cohen ,
S. J. Foltyn ,
P. Dowden ,
J. Ramirez-Castellanos ,
J. M. Gonzalez-Calbet ,
M. Vallet-Regi  and
J. L. MacManus-Driscoll
A. Berenov
Affiliation:
Center for High Temperature Superconductivity, Imperial College of Science Technology and Medicine, Prince Consort Road, London SW7 2BP, United Kingdom
N. Malde
Affiliation:
Center for High Temperature Superconductivity, Imperial College of Science Technology and Medicine, Prince Consort Road, London SW7 2BP, United Kingdom
Y. Bugoslavsky
Affiliation:
Center for High Temperature Superconductivity, Imperial College of Science Technology and Medicine, Prince Consort Road, London SW7 2BP, United Kingdom
L. F. Cohen
Affiliation:
Center for High Temperature Superconductivity, Imperial College of Science Technology and Medicine, Prince Consort Road, London SW7 2BP, United Kingdom
S. J. Foltyn
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
P. Dowden
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. Ramirez-Castellanos
Affiliation:
Dpto. Quimica Inorganica, Facultad de Quimicas, Universidad Complutense, Madrid 28040, Spain
J. M. Gonzalez-Calbet
Affiliation:
Dpto. Quimica Inorganica, Facultad de Quimicas, Universidad Complutense, Madrid 28040, Spain
M. Vallet-Regi
Affiliation:
Dpto. Quimica Inorganica y Bioinorgánica, Facultad de Farmacia, Universidad Complutense, Madrid 28040, Spain
J. L. MacManus-Driscoll
Affiliation:
Center for High Temperature Superconductivity, Imperial College of Science Technology and Medicine, Prince Consort Road, London SW7 2BP, United Kingdom
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Abstract

Microstructural and magnetic characterization were undertaken on high-rate, high-temperature grown YBa2Cu3O7–δ (YBCO) films. The films were of approximately 1 μm thickness and were grown by pulsed laser deposition on (100) SrTiO3 using a high-power industrial laser at growth temperatures between 750 °C and 870 °C and at growth rates of up to 4 μm/min. Two YBCO layers with different c-lattice parameters were observed in the films, the higher c value occurring near the substrate interface and arising from cation disorder and oxygen nonstoichiometry, and the lower one near the film surface arising from cation disorder alone. BaCuO2 precipitates were present near the surface of the films, indicative of partial melting during growth. The amount of BaCuO2 increased with growth temperature. Epitaxial Y2O3 also formed in increasing amounts suggestive of a different partial melting reaction in the films compared to bulk YBCO, where Y2BaCuO5 coexists with liquid. Around 1 MA/cm2 values of high critical current density (Jc) were observed in the films, and the in-field Jc improved with growth temperature despite the fact that the superconducting transition width increased significantly.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 4 , April 2003 , pp. 956 - 964
Copyright
Copyright © Materials Research Society 2003

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