Rare earth substitution in AFe2As2 single crystals

ORAL

Abstract

Synthesis and characterization of aliovalent light rare earth substitutions for alkaline earth atoms are studied in single crystals of FeAs-based compounds with the ThCr2Si2 structure. Electrical resistivity, magnetic susceptibility and structural parameters determined via x-ray and neutron scattering techniques are investigated as a function of chemical pressure and charge doping induced by substitution. Measured physical properties are compared to the effects of external applied pressure on CaFe2As2, known to induce a collapse of the tetragonal unit cell.

*This work was supported by AFOSR MURI Grant FA9550-09-1-0603.

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Authors

  • Shanta Saha

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • University of Maryland at College Park
    • University of Maryland

  • Nick Butch

    • Center for Nanophysics and Advanced Materials, U. of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Department of Physics, University of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park
    • University of Maryland
    • Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland, College Park, MD 20742, USA

  • Tyler Drye

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • University of Maryland at College Park

  • Jeff Mcgill

    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD

  • Johnpierre Paglione

    • Center for Nanophysics and Advanced Materials, U. of Maryland
    • University of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Department of Physics, University of Maryland
    • University of Maryland at College Park
    • Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland, College Park, MD 20742, USA

  • Peter Zavalij

    • Department of Chemistry and Biochemistry, University of Maryland, College Park, MD

  • Jeffrey Lynn

    • NIST Center for Neutron Research, Gaithersburg, MD
    • National Institute of Standards and Technology
    • NIST Center for Neutron Research