Pressure shift of the superconducting T$_{c}$ of (Pr$_{1-x }$Sr$_{x})$FeAsO and Sm(O$_{1-x}$F$_{x})$FeAs

ORAL

Abstract

Pressure plays important role in discovery and unraveling physics of novel superconductors.High Tc iron-based layered compounds can be obtained by hole/electron-doping.To determine if a symmetry between electron and hole-doping exists,we investigated pressure-induced shift in T$_{c}$ by carryingout resistivity measurements under hydrostatic pressure on hole-doped Pr$_{1-x }$Sr$_{x}$FeAsO up to 1.8GPa using piston-cylinder clamp cell device.The coexistence of superconductivity {\&} spin-density wave behavior were observed and pressure effects on both being investigated. Four probe resistance measurements show T$_{c}$ increases (+dT$_{c}$/dP) with pressure for under-doped Pr$_{1-x}$Sr$_{x}$FeAsO similar to high-T$_{c}$ cuprates. High pressure can compress crystalline structure of material and force its layers to be closer,which might increase material's T$_{c}$ by improving pressure-induced charge transfer between (Fe$_{2}$As$_{2})$ and (Pr/Sr)O layers. The pressure effect on T$_{c}$ of Pr$_{1-x }$Sr$_{x}$FeAsO is being compared with that of electron doped Sm(O$_{1-x}$F$_{x})$FeAs. The results suggest a symmetry appear to exist between electron and hole-doping Fe-pnictide superconductors.

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Authors

  • Kalyan Sasmal

    • Department of Physics, TcSUH, University of Houston

  • G. Mu

    • Institute of Physics, Chinese Academy of Sciences

  • Haihu Wen

    • Institute of Physics, Chinese Academy of Sciences
    • Laboratory for Superconductivity, IOP

  • Bernd Lorenz

    • Department of Physics and TcSUH at the University of Houston
    • Department of Physics, TcSUH, University of Houston
    • Univ of Houston
    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77024-5002, USA
    • Dept. of Physics and TcSUH, University of Houston

  • Paul C. W. Chu

    • Texas Center for Superconductivity at University of Houston and Department of Physics,Lawrence Berkeley National Laboratory
    • Department of Physics and TcSUH at the University of Houston; Lawrence Berkeley National Laboratory
    • Department of Physics, TcSUH, University of Houston and Lawrence Berkeley National Laboratory
    • Dept. of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002
    • Univ of Houston
    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77024-5002, USA
    • Department of Physics and TcSUH, University of Houston
    • Dept. of Physics and TcSUH, University of Houston
    • Texas Center for Superconductivity, University of Houston and Lawrence Berkeley National Laboratory