Field dependence of the magnetic order in Co$_3$V$_2$O$_8$

ORAL

Abstract

Co$_{3}$V$_{2}$O$_{8}$ (CVO) has a geometrically frustrated magnetic lattice, a Kagom$\acute{e}$ staircase. In zero field [1], CVO initially orders magnetically at 11.3 K into an incommensurate phase, with wave vector $k$ = (0,$\delta$,0) with $\delta$ = 0.55. $\delta$ decreases monotonically with decreasing temperature. It locks into a commensurate antiferromagnetic value of $\frac{1}{2}$ and $\frac{1}{3}$ before the ferromagnetic ground state ($\delta~=~0$) is revealed at 6.2 K. The spin direction for all spins is along the $a$ axis. A theory based on a minimal Ising model with competing exchange interactions can explain the basic features of the magnetic ordering. The application of magnetic field along the $a$ axis strongly affects all of the phases. In particular, the ferromagnetic state is suppressed in favor of the $\delta=0.5$ antiferromagnetic state. [1] Y. Chen, J. W. Lynn, Q. Huang, F. M. Woodward, T. Yildirim, G. Lawes, A. P. Ramirez, N. Rogado, R. J. Cava, A. Aharony, O. Entin-Wohlman, and A. B. Harris, Phys. Rev. B 74, 014430 (2006).

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Authors

  • Ying Gasparovic

    • NCNR, NIST, Dept. Mater. Sci., University of Maryland
    • NIST
    • NIST Center for Neutron Research and University of Maryland

  • J.W. Lynn

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

  • Q. Huang

    • NIST Center for Neutron Research
    • NIST Center for Neutron Research, Gaithersburg, Maryland 20899

  • F. M. Woodward

    • NIST Center for Neutron Research

  • Taner Yildirim

    • NIST Center for Neutron Research
    • NIST Center for Neutron Research and University of Pennsylvania

  • G. Lawes

    • Wayne State University
    • Wayne State Univ.

  • A. P. Ramirez

    • Bell Labs

  • N. Rogado

    • Princeton Univ. and DuPont Central Research and Development

  • R.J. Cava

    • Princeton University
    • Princeton Univ.
    • Department of Chemistry, Princeton University
    • Department of Chemistry, Princeton University, Princeton, NJ 08540, USA
    • Department of Chemistry, Princeton University, Princeton NJ 08544, USA

  • A. Aharony

    • Tel Aviv Univ. and Ben Gurion Univ.

  • O. Entin-Wohlman

    • Tel Aviv Univ. and Ben Gurion Univ.

  • A. Brooks Harris

    • University of Pennsylvania
    • Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104