Abstract
To prevent the loss of K in growing single crystals of Ba1−x K x Fe2As2 we developed a rapid-heating Sn-flux method. Large single crystals with the optimal superconducting transition temperature T C≈38 K were obtained and their structural, chemical and superconducting properties were investigated. Additionally, the effect of post-growth annealing on these crystals at different temperatures was examined. Scanning electron microscopy microprobe studies on a crystal with the composition goal of Ba0.25K0.75Fe2As2 revealed a well defined separation of two phases with compositions that are suggestive of rational ratios of the K and Ba content.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Reuvekamp, P., Razavi, F.S., Hoch, C. et al. Spontaneous Stoichiometry Change in Single Crystals of Superconducting (Ba1−x K x )Fe2As2 Grown by a Rapid-Heating Sn-Flux Method. J Supercond Nov Magn 22, 353–356 (2009). https://doi.org/10.1007/s10948-009-0451-3
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DOI: https://doi.org/10.1007/s10948-009-0451-3