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Growth and characterization of A<sub>1−<i>x</i></sub>K<sub><i>x</i></sub>Fe<sub>2</sub>As<sub>2</sub>(A = Ba, Sr) single crystals with<i>x</i>= 0–0.4
Single crystals of A1−xKxFe2As2 (A = Ba, Sr) with high quality have been grown successfully by an FeAs self-flux method. The samples have sizes up to 4 mm with flat and shiny surfaces. The x-ray diffraction patterns suggest that they have high crystalline quality and c-axis orientation. The non-superconducting crystals …