Universitat de Barcelona
2017-11-10T17:03:05Z
2017-11-10T17:03:05Z
2003-06-02
2017-11-10T17:03:05Z
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.
Article
Versió publicada
Anglès
Pel·lícules fines; Porositat; Superconductivitat; Revestiments; Thin films; Porosity; Superconductivity; Coatings
Institute of Electrical and Electronics Engineers (IEEE)
Reproducció del document publicat a: https://doi.org/10.1109/TASC.2003.811832
IEEE Transactions on Applied Superconductivity, 2003, vol. 13, num. 2, p. 2504-2507
https://doi.org/10.1109/TASC.2003.811832
(c) Institute of Electrical and Electronics Engineers (IEEE), 2003
