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Title: Influence of porosity on the critical currents of trifluoroacetate-MOD YBa2Cu3O7 films
Author: Castaño Linares, Óscar
Cavallaro, Andrea
Palau Masoliver, Anna
González, J. C.
Rossell, Marta Dàcil
Puig, Teresa
Piñol, S.
Mestres Andreu, Narcís
Sandiumenge Ortiz, Felip
Pomar Barbeito, Alberto
Obradors, Xavier
Keywords: Pel·lícules fines
Thin films
Issue Date: 2-Jun-2003
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Abstract: The influence of porosity on the superconducting properties have been investigated on YBa/sub 2/Cu/sub 3/O/sub 7/ thin films deposited on LaAlO/sub 3/ [100] substrates by the so-called Trifluoroacetate (TFA) route. Micro-Raman spectroscopy have been used to determine the concentration of c-axis grains /spl delta/ in different samples and their influence on the final film porosity as observed from SEM imaging. This has been compared with measurements of resistivity and critical currents in the same samples. We prove that this /spl delta/ fraction is the main parameter controlling the porosity and hence the normal-state resistivity of the thin films. The optimization of the microstructure of these YBa/sub 2/Cu/sub 3/O/sub 7/ TFA films allow to have high critical currents : J/sub c/ = 3 /spl times/ 10/sup 6/ A/cm/sup 2/ at 77 K.
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It is part of: IEEE Transactions on Applied Superconductivity, 2003, vol. 13, num. 2, p. 2504-2507
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ISSN: 1051-8223
Appears in Collections:Articles publicats en revistes (Electrònica)

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