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Superficies y vacío
versão impressa ISSN 1665-3521
Superf. vacío vol.20 no.3 Ciudad de México Set. 2007
Superconducting depression in thin films of YBa2Cu3O7-δ based on the variation of the relative humidity and the time
J. C. Caicedo1*, W. Saldarraiga1*, F. Pérez*, J. - G. Ramírez1* M. E. Gómez1*, P. Prieto1*, C. Cortés-Escobedo2
1 Grupo de Películas Delgadas, Universidad del Valle, Cali - Colombia, * Universidad Tecnológica de Pereira
2 Centro de Investigación e Innovación Tecnológica del IPN -México
Recibido: 16 de octubre de 2006.
Aceptado: 5 de marzo de 2007.
Abstract
Thin films of YBa2Cu3O7-δ grown on SrTiO3 (100) single crystal substrates by sputtering DC technique to high oxygen pressures were put under different conditions of relative humidity from 24 to 100% and different times of exposition. The electrical, morphologic and structural characteristics of the films by means of curves R-T, atomic force microscopy (AFM) and X-ray diffraction (XRD) were analyzed. The effect on structural and transport properties with the environmental conditions of relative humidity and with time were systematically studied. Samples under relative humidity around 24% measured just later of deposition showed a critical temperature (TC) of 92 K, and thin films exposed around 90% of relative humidity with times greater to 104 s (1 day) showed a TC of 16 K, while samples under a relative humidity 100% do not showed the superconductive phase. The degradation's causes of superconductive properties in this system were investigated.
Keywords: Relative humidity and time; D.C sputtering; YBa2Cu3O7-δ.
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Acknowledgements
This work was supported by COLCIENCIAS, through the 1106-05-11458 research project.
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