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Single crystals of Fe1+δTe1−xSex (0≤x≤0.5) were grown via both Bridgman and self-flux techniques. Large crystals of size ∅10×50 mm could be obtained with the Bridgman method. The excess of iron, δ≥0.07, at interstitial sites was observed to deteriorate the superconductivity of the samples. Study of semiconducting and Curie–Weiss-like behavior indicates that an appearance of a hump for Fe1+δTe...
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