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