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Influence of porosity on the critical currents of trifluoroacetate-MOD YBa2Cu3O7 films
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
Universitat de Barcelona
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.
Pel·lícules fines
Porositat
Superconductivitat
Revestiments
Thin films
Porosity
Superconductivity
Coatings
(c) Institute of Electrical and Electronics Engineers (IEEE), 2003
Artículo
info:eu-repo/semantics/publishedVersion
Institute of Electrical and Electronics Engineers (IEEE)
         

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