Annealing study of (Ca,R)Fe2As2 single crystals synthesized using Sn flux

POSTER

Abstract

The superconducting parent compound CaFe$_{2}$As$_{2}$ displays an AFM transition at 168 K that is closely linked to an orthorhombic structural distortion. Studies on self-flux (FeAs) grown crystals have revealed the ability to tune the structural and magnetic properties of this system by annealing, resulting in a phase diagram that spans from tetragonal/orthorhombic antiferromagnetism to the non-magnetic collapsed tetragonal phase. In this study, we investigate the effects of annealing on (Ca,R)Fe$_{2}$As$_{2}$ (R$=$rare earth) crystals grown in Sn flux in order to understand the role of growth conditions on the resultant phase diagram. We present investigations of x-ray, EDS, electrical transport and magnetization measurements and compare the resultant phase diagram with that of the self-flux case.

Authors

  • Connor Roncaioli

    • Univ of Maryland-College Park

  • Tyler Drye

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

  • Shanta Saha

    • University of Mayland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742
    • Univ of Maryland-College Park

  • Johnierre Paglione

    • University of Maryland
    • University of Maryland, College Park
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland
    • University of Mayland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742
    • Univ of Maryland-College Park