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Leca, Victor
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article
Mecanism de creştere şi proprietǎţi ale filmelor subţiri de YBa2Cu3O7-αdepuse prin ablaţie laser PE (001) SrTiO3
Abstract
<p>High quality, single phase c-axis oriented YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-α</sub> thin films with superconducting properties were grown by laser ablation on (001) SrTiO<sub>3</sub> substrates. The surface morphology of the films has been investigated by means of high-pressure reflection high energy electron diffraction (RHEED), atomic force microscopy (AFM), and scanning electron microscopy (SEM), while the structural properties were studied by X-ray diffraction (XRD). Deposition under optimum conditions produces films with relatively smooth surface, with a roughness of about 10-15 nm, as confirmed by AFM and SEM data. The growth follows a Stransky-Krastanov mechanism governed by the substrate-film interface properties due to presence of epitaxial strain. The films show good superconducting properties with T<sub>c</sub> values of 85-91 K. Results on the fabrication and electrical transport properties of ramp-type Josephson junctions with YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-α</sub> electrodes and PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-α</sub> barrier are presented.</p>