Magnetic Structure and Crystal Field Potential of PrOs$_4$As$_{12}$

ORAL

Abstract

Neutron powder diffraction and elastic neutron scattering have been used to determine the magnetic structure of the Filled Skutterudite compound PrOs$_4$As$_{12}$. The system becomes antiferromagnetically ordered with a Neel temperature ($T_N$) at 2.28K, which has A-type magnetic structure with spins lying along the doubled axis of the magnetic unit cell. The crystal field potential of PrOs$_4$As$_{12}$ has been studied by inelastic neutron scattering (INS). The ground state in the $T_h$ point group symmetry is determined to be a $\Gamma_5$ triplet. This is confirmed by Zeeman effect exhibited at low temperatures under high magnetic fields.

*The work was supported by DOE DE-FG02-05ER46202. ORNL is managed by UT-Battelle, LLC, for the U.S. Dept. of Energy under contract DE-AC05-00OR22725.

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Authors

  • Songxue Chi

    • The University of Tennessee, Knoxville

  • Pengcheng Dai

    • University of Tennessee
    • The University of Tennessee, Knoxville

  • Hye Jung Kang

    • NIST Center for Neutron Research
    • NIST Center for Neutron Scattering
    • University of Tennessee, NIST, University of Maryland

  • J.W. Lynn

    • NCNR, NIST
    • NIST Center for Neutron Research
    • NIST Center for Neutron Scattering

  • F. Ye

    • Oak Ridge National Laboratory

  • Z. Henkie

    • Institute of Low Temperature and structure research, Poland

  • A. Pietraszko

    • Institute of Low Temperature and structure research, Poland

  • Brian Maple

    • IPAPS and Physics, UCSD
    • University of California, San Diego
    • Department of Physics, University of California, San Diego
    • University of California San Diego