High Pressure Synthesis and properties of (Ca,Pr)Fe$_{2}$As$_{2}$

ORAL

Abstract

Despite impressively high superconducting transition temperatures approaching 50 K, superconductivity in rare earth-doped CaFe$_{2}$As$_{2}$ appears to only involve a small volume fraction as determined by shielding fraction. In addition, the amount of Pr that can be doped into the system via ambient pressure flux synthesis is limited to \textless 15{\%}, due to a width of formation limitation. We report a study using high-pressure flux growth to substitute higher levels of Pr approaching 40{\%} concentration. The superconducting properties of the resultant crystals are presented, including chemical composition, resistivity, and magnetization measurements. The final result is a complete phase diagram for the Pr-doped CaFe$_{2}$As$_{2}$ system.

*Work supported by an ICAM Junior Scientist Travel Award and an AFOSR MURI grant.

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Authors

  • Tyler Drye

    • Center for Nanophysics and Advanced Materials, Department of Physics, Univ of Maryland-College Park
    • Univ of Maryland-College Park

  • Valentin Taufour

    • Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, U.S.A.
    • Critical Material Institute, Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, U.S.A.
    • Ames Lab, Department of Physics, Iowa State University
    • The Ames Laboratory, Iowa State University, Ames, USA

  • Udhara Kaluarachchi

    • Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, U.S.A.
    • Ames Lab, Department of Physics, Iowa State University

  • Sheng Ran

    • Iowa State University, Ames Lab
    • Ames Laboratory/ Iowa State University
    • The Ames Laboratory, Ames, IA 50011, USA
    • Ames Lab, Department of Physics, Iowa State University

  • Paul C. Canfield

    • Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, U.S.A.
    • Iowa State University, Ames Lab
    • Ames Laboratory/ Iowa State University
    • Iowa State University
    • Ames Laboratory
    • Iowa State Univ
    • Ames Laboratory and Dept. of Physics, Iowa State University
    • The Ames Laboratory, Ames, IA 50011, USA
    • Ames Lab, Department of Physics, Iowa State University
    • The Ames Laboratory, Iowa State University, Ames, USA
    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University

  • Johnpierre Paglione

    • Center for Nanophysics and Advanced Materials, Department of Physics, Univ of Maryland-College Park