Influence of porosity on the critical currents of trifluoroacetate-MOD YBa2Cu3O7 films

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 grai...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2003-06, Vol.13 (2), p.2504-2507
Main Authors: CASTANO, O, CAVALLARO, A, OBRADORS, X, PALAU, A, GONZALEZ, J. C, ROSELL, M, PUIG, T, PINOL, S, MESTRES, N, SANDIUMENGE, F, POMAR, A
Format: Article
Language:English
Subjects:
Applied sciences
Coatings
Electronics
Exact sciences and technology
Microelectronic fabrication (materials and surfaces technology)
Pel·lícules fines
Porositat
Porosity
Revestiments
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconductivitat
Superconductivity
Thin films
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Summary: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.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2003.811832