Quasi-two-dimensional spin-1/2 magnetism in $\alpha$-TeVO$_{4}$

ORAL

Abstract

$\alpha$-TeVO$_{4}$ is a monoclinic structure where four spin- 1/2 V$^{4+}$ ions per unit cell form chain-like structures extending along the b-axis. Using the new MACS spectrometer at the NIST Center for Neutron Research, we have carried out a comprehensive investigation of magnetism in this compound. The phase transition at T$_C$ = 16 K is to long range order that can be described as ferromagnetic planes stacked antiferromagnetically along the (1,0,$\bar{2}$) direction. Powder diffraction indicates moments oriented along b-axis with a magnitude of 0.81(3) $\mu_B$ at T=1.4 K. The inelastic scattering data reveal a strongly anisotropic magnon dispersion relation which is almost independent of wave vector transfer along (1,0,$\bar{2}$) at high energies. Work at JHU is supported by the DoE through DE-FG02-08ER46544.

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Authors

  • Y. Zhao

    • Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA

  • J.A. Rodriguez

    • Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA

  • P. Lemmens

    • Institute for Condensed Matter Physics, TU Braunschweig, D-38106 Braunschweig, Germany

  • H. Berger

    • Inst. Phys. Mat. Complexe, EPFL, CH-1015 Lausanne, Switzerland

  • Collin Broholm

    • Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
    • John Hopkins University