Effect of Uniaxial Stress for Pressure-Induced Superconductor SrFe2As2
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概要
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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 $P_{\text{c}}$ was found to depend on the type of medium. $P_{\text{c}}$ 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.
- 2009-08-15
著者
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KOTEGAWA Hisashi
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Tou Hideki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Murata Keizo
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Sugawara Hitoshi
Faculty Of Engineering Iwate University
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Kawazoe Takayuki
Department of Physics, Kobe University, Kobe 657-8501
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Murata Keizo
Division of Molecular Materials Science, Graduate School of Science, Osaka City University, Osaka 558-8585
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