Abstract
Superconducting epitaxial FeSe0.5Te0.5 thin films are prepared on SrTiO3(001) substrates by pulsed laser deposition. The high purity of the phase, the quality of thegrowth and the epitaxy are studied with different experimental techniques: x-raysdiffraction, reflection high energy electron diffraction, scanning tunneling microscopy andatomic force microscopy. The substrate temperature during the deposition is found to bethe main parameter governing sample morphology and superconducting criticaltemperature. Films obtained under optimal conditions show an epitaxial growth with thec axis perpendicular to the film surface and thea andb axes parallel to the substrate, without evidence of any other orientation. Moreover, suchfilms exhibit a metallic behavior over the whole measured temperature range andthe critical temperature is above 17 K, which is higher than the target value.
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