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Excess interstitial Fe atoms in as-grown FeSe 1−x Te x  single crystals are unavoidable in the self-flux growing procedure. As harmful defects to the study of superconductivity and Majorana fermions, the excess Fe atoms are usually removed by the post-annealing procedure. This two-step method is mostly used to obtain high quality FeSe 1−x Te x  single crystals in present studies. Here, we carried out a one-step way to synthesize FeSe 1−x Te x  single crystals without excess Fe content using a chemical vapor transport method. By combining transport measurement, magnetic measurement, and local scanning tunneling microscopy measurement, we prove that there is no excess Fe content in our one-step grown FeSe 0.45 Te 0.55  single crystals. This work provides a new convenient way to obtain pure FeSe 0.45 Te 0.55  single crystals and may be helpful to better study this exotic material.

One-step synthesis of FeSe0.45Te0.55 single crystals without excess Fe content