Gapless antiferromagnetic behavior in newly synthesized marcasite-phase CoAsSe

ORAL

Abstract

CoAsSe belongs to the CoXY chalcogenide family and is reported to crystalize in different phases depending on the synthesizing temperature and pressure, including a half metallic phase according to DFT calculations. For the first time, we have synthesized marcasite-phase CoAsSe in large amount to perform neutron scattering measurements. Elastic neutron scattering measurements revealed weak magnetic peaks below T ~ 38 K at momentum transfer positions of (0, 0.5, 0) and (1, 0, 0) in reciprocal lattice units. Detailed inelastic measurements in low temperature revealed a broad excitation spectrum in the energy transfer-momentum transfer map. We will present the magnetic structures of the newly synthesized marcasite phase CoAsSe and discuss its relationship to electrical measurement results.

*The research at MU is supported by DOE, Office of Basic Energy Sciences under grant no. DE-SC0014461.

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Presenters

  • Yiyao Chen

    • Univ of Missouri - Columbia

Authors

  • Yiyao Chen

    • Univ of Missouri - Columbia

  • George Yumnam

    • Univ of Missouri - Columbia

  • Ashutosh Dahal

    • Univ of Missouri - Columbia

  • Jose Rodriguez-Rivera

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

  • Guangyong Xu

    • Center of Neutron Research, National Institute of Standards and Technology
    • Neutron-Condensed Matter Science Group, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • NIST
    • Center for Neutron Research, National Institute of Standards and Technology
    • NIST Center for Neutron Research
    • Oak Ridge National Laboratory

  • Thomas Heitmann

    • University of Missouri Research Reactor
    • MU Research Reactor, Univ of Missouri - Columbia, MO 65211 USA
    • Missouri Research Reactor, University of Missouri
    • University of Missouri
    • MURR
    • The Missouri Research Reactor, University of Missouri - Columbia
    • The Missouri Research Reactor, University of Missouri Columbia
    • Research Reactor-MURR; Physics & Astronomy, Univ of Missouri, Columbia
    • Univ of Missouri - Columbia

  • Deepak K Singh

    • Univ of Missouri - Columbia
    • Department of Physics and Astronomy, University of Missouri - Columbia