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An eutectic LiCl/KCl flux method in a horizontal configuration has been used to grow a series of homogeneous Fe₁+Se₁-ₗTeₓ single crystals of high quality with 0. 5 x 1. Compared with previously used melt-growth method, the stable crystallization process in LiCl/KCl flux below their peritectic temperatures results in better homogeneity and crystalline perfection identified by energy dispersive spectrometer and x-ray diffraction. The interstitial Fe value remains small within 0. 5 x 0. 85 where the superconducting temperature TC is not sensitive to the Te content with sharp superconducting transition widths TC 0. 1 followed by the disappearance of superconductivity and emergence of antiferromagnetic order at x 0. 96. We also observed a metallic to semiconducting transition in the normal state resistivity of Fe₁+Se₁-ₗTeₓ with increasing Te content which is related to a localized electronic state induced by the interstitial Fe. The interstitial Fe value might be a key physical parameter to understand various properties of Fe₁+Se₁-ₗTeₓ system.
Wang et al. (Sun,) studied this question.
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