Abstract
In this study Te-rich iron chalcogenide (FeSexTe1−x) thin films with a composition close to antiferromagnetic ordering have been deposited on SrTiO3 (STO) substrates. The superconducting critical transition temperature (Tc) of the FeSe0.1Te0.9 thin film on STO substrate ranges from ∼12.5 to ∼13.3 K. The upper critical field is as high as 114 T, which is much higher than that of the FeSe0.5Te0.5 thin film on STO substrate (∼49 T). The self-field critical current density () at 2 K of 1.8 × 105 A cm−2 is much higher than that of the FeSe0.5Te0.5 thin film, and the FeSe0.1Te0.9 thin film also demonstrates superior pinning properties under applied magnetic field. Compared to FeSe0.5Te0.5, which was considered as the optimum composition, FeSe0.1Te0.9 presents even more promise for high field applications because of its high upper critical field and high critical current density.
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