Co3Sn2S2 polycrystals were obtained by mixing high-purity elements with desired stoichiometry. The polycrystalline samples of Co3Sn2S2 were sealed in a quartz tube with some iodine under a partial Argon pressure. The samples were heated to 1000°C over 6 hours and kept for 24 hours before being slowly cooled to 600°C over 7 days. Large single-crystalline ingots up to centimeter size were obtained at the bottom of the quartz tubes.

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