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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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Published in: | Superconductor science & technology 2009-01, Vol.22 (9), p.095018 (5)-095018 (5) |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
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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. |
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ISSN: | 0953-2048 |
DOI: | 10.1088/0953-2048/22/9/095018 |