Single Crystal Growth and Pressure Effect on Superconductivity of FeSe₁₋ₓ Sₓ

Abstract FeSe₁₋ₓ Sₓ FeSe 1 - x S x is known to have a characteristic phase diagram where superconducting (SC), nematic and antiferromagnetic (AFM) phases coexist or compete to each other. We report single crystal growth of FeSe₁₋ₓ Sₓ FeSe 1 - x S x and pressure effect on superconductivity for the specimens with x =0.02 through the measurements of DC magnetization ( M ) and electrical resistivity ( ρ ρ ) as a function of temperature ( T ). Single crystals of FeSe₁₋ₓ Sₓ FeSe 1 - x S x ( x≤ 0.17 x ≤ 0.17 ) with a maximum dimension of 1.5 × × 1.5 mm² mm 2 were successfully obtained by a chemical vapor transport method. The M ( T ) and ρ ρ ( T ) measurements have revealed that a nematic phase is suppressed and disappears at ~ ∼ 1.5 GPa, where superconducting transition temperature Tc T c shows a local minimum, while AFM phases appear separately inside and outside the nematic phase. A crossover of superconductivity near the end point of AFM phase reported in our previous study for x≥ 0.04 x ≥ 0.04 was not observed for x =0.02.