Dimensional Crossover in ZnMn$_{2}$O$_{4}$

ORAL

Abstract

ZnMn$_{2}$O$_{4}$ crystallizes at high temperatures as a cubic spinel. At lower temperatures, it undergoes a Jahn Teller distortion which lowers its symmetry to tetragonal. At lower temperatures (TN\~{ }60 K), the system orders magnetically. Fits to the order parameter, line shape of powder diffraction peaks, and the direct observation of rods of scattering in single crystal diffraction experiments show the system to be two dimensional. This is likely due to the interplay between orbital ordering and frustration. In this talk I discuss the magnetic structure and spin waves of this system. I will also discuss an interesting crossover in the dimensionality of the magnetism in this compound.

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Authors

  • William Ratcliff

    • National Institute of Standards and Technology (NCNR)

  • Y. Chen

    • National Institute of Standards and Technology
    • National Institute of Standards and Technology (NCNR), U. Maryland (Materials Science and Engineering)
    • NIST Center for Neutron Scattering
    • University of Maryland and NCNR

  • Goran Gasparovic

    • National Institute of Standards and Technology (NCNR), U. Maryland (Materials Science and Engineering)

  • Yiming Qiu

    • National Institute of Standards and Technology (NCNR), U. Maryland (Materials Science and Engineering)
    • Department of Materials Science and Engineering, University of Maryland

  • Qingzhen Huang

    • NIST Center for Neutron Research
    • NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
    • National Institute of Standards and Technology (NCNR)

  • Jeff Lynn

    • NIST Center for Neutron Research
    • National Institute of Standards and Technology (NCNR)
    • National Institute of Standards and Technology

  • Sunmog Yeo

    • Rutgers University (Department of Physics)

  • S.-W. Cheong

    • Rutgers University
    • RCEM and Rutgers University, Piscataway, NJ
    • Rutgers University (Deparment of Physics)
    • Rutgers Univ.
    • Department of Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
    • Rutgers Center for Emergent Materials and Department of Physics \& Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
    • Rutgers Center for Emergent Materials and Department of Physics \& Astronomy, Rutgers University, Piscataway, New Jersey 08854

  • Paula Piccoli

    • Argonne National Lab (IPNS)

  • Arthur Schultz

    • Argonne National Lab (IPNS)
    • Argonne National Laboratory