Magnetic phase diagram of Ca(Co$_{1-x}$Fe$_{x}$)$_{2}$As$_{2}$ ($x \le $ 0.1) single crystals

ORAL

Abstract

Both CaCo$_{2}$As$_{2}$ and CaFe$_{2}$As$_{2}$ possess the tetragonal ThCr$_{2}$Si$_{2}$ crystal structure and are paramagnetic at room temperature and ambient pressure. Upon cooling, CaCo$_{2}$As$_{2}$ shows A-type antiferromagnetic (AFM) order below a N\'{e}el temperature of $T_{N\, }\approx $ 50-70 K, while CaFe$_{2}$As$_{2}$ transitions to an orthorhombic lattice with stripe-type AFM order below $T_{N\, }\approx $ 170 K. Here, we present results from neutron diffraction experiments on a series of Ca(Co$_{1-x}$Fe$_{x}$)$_{2}$As$_{2}$ single crystals ($x =$ 0 to 0.1) studying the evolution of CaCo$_{2}$As$_{2}$'s low-temperature state upon substituting Fe for Co. We find that A-type magnetic order persists for all of the values of $x$ studied with suppressed $T_{N}$ and ordered moment for increasing Co concentration and present the magnetic phase diagram for the Co rich region.\\[4pt] Work at Ames Laboratory was supported by US DOE, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02-07CH11358. Research conducted at ORNL's High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US DOE.

–

Authors

  • W.T. Jayasekara

    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
    • Ames Laboratory US DOE, Department of Physics and Astronomy, Iowa State University

  • B.G. Ueland

    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University

  • Abhishek Pandey

    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • V.K. Anand

    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • N.S. Sangeetha

    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
    • Ames Laboratory US DOE, Department of Physics and Astronomy, Iowa State University

  • W. Tian

    • Quantum Condensed Matter Division, ORNL
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge Natl Lab, TN, USA

  • D.C. Johnston

    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
    • Ames Laboratory US DOE, Department of Physics and Astronomy, Iowa State University

  • A. Kreyssig

    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
    • Ames Laboratory US DOE, Department of Physics and Astronomy, Iowa State University

  • A.I. Goldman

    • Ames Laboratory and Iowa State University
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
    • Ames Laboratory US DOE, Department of Physics and Astronomy, Iowa State University