Temperature-Pressure Phase Diagram of Lightly Hole-doped BaFe$_2$As$_2$

ORAL

Abstract

Chemical doping and application of pressure are the two common tools to tune the electronic structure of a material. Although electron-doping on Fe-site in BaFe$_2$As$_2$ gives superconductivity up to $\sim$ 22 K, it is puzzling that hole-doping does not. For this reason, we decided to carry out pressure studies on a few lightly Cr- or Mo-doped crystals of BaFe$_2$As$_2$. We have applied pressures of up to 2~GPa using a cylinder cell, and Fluorinert as pressure medium. Our preliminary findings reveal the shift of antiferromagnetic ordering temperatures to lower with pressure, and a down-turn in resistivity at low temperatures and pressures, which may be attributed to superconductivity.

*This work was partly supported by the Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Authors

  • Balazs Sipos

    • Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 USA

  • Athena Safa-Sefat

    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 USA
    • Oak Ridge National Laboratory, Oak Ridge, TN
    • Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • B.C. Sales

    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 USA
    • Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA