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Superconducting Fe1+deltaSe1-xTex thin films: growth, characterization and properties

Thin films of Fe1+deltaSe1-xTex (delta~0.18 and x~0.5) have been successfully grown on (100)-oriented single-crystalline SrTiO3 and LaAlO3 substrates by pulsed laser deposition. The crystal structure was characterized by x-ray diffraction and the superconducting properties by electrical resistivity...

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Bibliographic Details
Published in:Superconductor science & technology 2009-01, Vol.22 (9), p.095018 (5)-095018 (5)
Main Authors: Kumary, T Geetha, Baisnab, Dipak Kumar, Janaki, J, Mani, Awadhesh, Satya, A T, Sarguna, R M, Ajikumar, P K, Tyagi, A K, Bharathi, A
Format: Article
Language:English
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Summary:Thin films of Fe1+deltaSe1-xTex (delta~0.18 and x~0.5) have been successfully grown on (100)-oriented single-crystalline SrTiO3 and LaAlO3 substrates by pulsed laser deposition. The crystal structure was characterized by x-ray diffraction and the superconducting properties by electrical resistivity measurements. X-ray diffraction analysis establishes the growth of films with c-axis orientation. Atomic force microscopy showed a smooth surface morphology for the films grown on SrTiO3 substrates. All the films are observed to be superconducting with a transition temperature, Tc of ~8-14 K, depending on the deposition conditions. The deposition parameters were optimized to obtain good quality films with Tc comparable to that of the target material. The upper critical field shows a positive curvature near Tc unlike the opposite behavior observed in conventional superconductors.
ISSN:0953-2048
DOI:10.1088/0953-2048/22/9/095018