Effect of Cooling Rate on Structure, Composition, and Superconducting Properties of FeTe0.6Se0.4 Prepared by Self-Flux Technique

To study the influence of the sample preparation procedure on the superconducting properties of FeSe x Te 1−x , we have grown two FeSe 0.4 Te 0.6 crystals and investigated their superconducting properties. One of the crystals possessed a secondary phase of Fe 3 Se 2.1 Te 1.8 , while the other was a high-quality FeSe 0.4 Te 0.6 single crystal. We have checked the sample compositions and phases via energy dispersive x-ray spectroscopy to obtain a more sophisticated picture of the inclusions. Our susceptibility measurements under hydrostatic pressure show that neither pressure up to 9 kbar nor stress is sufficient to obtain a superconducting state in the homogeneous crystal. The critical temperature of two-phase FeSe 0.4 Te 0.6 increases at 8.9 kbar from 12.3 K to T c =17.9 K. Therefore, we conclude that inhomogeneities are a necessary feature for providing superconductivity in this iron chalcogenide system. We have prepared Fe 3 Se 2.1 Te 1.8 polycrystals and studied their magnetic properties for comparison.

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Effect of Cooling Rate on Structure, Composition, and Superconducting Properties of FeTe0.6Se0.4 Prepared by Self-Flux Technique

Cited by 2 publications

References 16 publications

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Enhancement of Magnetic and Transport Properties of Superconducting Fe1−xMnxSe0.5Te0.5 Single Crystals

Inhomogeneities and superconductivity in poly-phase Fe-Se-Te systems

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