Effect of uniaxial stress for pressure-induced superconductor SrFe2As2

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  • Kotegawa Hisashi
    Department of Physics, Kobe University JST, Transformative Research — Project on Iron Pnictides (TRIP)
  • Kawazoe Takayuki
    Department of Physics, Kobe University
  • Sugawara Hitoshi
    Faculty of Integrated Arts and Science, Tokushima University
  • Murata Keizo
    Division of Molecular Materials Science, Graduate School of Science, Osaka City University
  • Tou Hideki
    Department of Physics, Kobe University JST, Transformative Research — Project on Iron Pnictides (TRIP)

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  • Effect of Uniaxial Stress for Pressure-Induced Superconductor SrFe<SUB>2</SUB>As<SUB>2</SUB>

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We report that the pressure–temperature phase diagram of single-crystalline SrFe2As2 is easily affected by the hydrostaticity of a pressure-transmitting medium. For all of the three mediums we used, superconductivity with zero resistance appears, accompanied by the suppression of an antiferromagnetic (orthorhombic) phase, but the critical pressure Pc was found to depend on the type of medium. Pc was estimated to be 4.4 GPa under almost hydrostatic condition, but it decreased to 3.4–3.7 GPa with the use of the medium already solidified at room temperature. The uniaxial stress along the c-axis is suggested to aid in the suppression of the antiferromagnetic (orthorhombic) phase. The pressure effect of BaFe2As2 is also reported.

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