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We report that the pressure-temperature phase diagram of single-crystallineSrFe$_2$As$_2$ is easily affected by the hydrostaticity of apressure-transmitting medium. For all of the three mediums we used,superconductivity with zero resistance appears, accompanied by the suppressionof an antiferromagnetic (orthorhombic) phase, but the critical pressure $P_c$was found to depend on the type of medium. $P_c$ was estimated to be 4.4 GPaunder almost hydrostatic condition, but it decreased to $3.4-3.7$ GPa with theuse of the medium already solidified at room temperature. The uniaxial stressalong the c-axis is suggested to aid in the suppression of theantiferromagnetic (orthorhombic) phase. The pressure effect of BaFe$_2$As$_2$is also reported.

Effect of Uniaxial Stress for Pressure-Induced Superconductor SrFe_2As_2