Field-induced spontaneous magnon decay in a spin-1/2 coupled two-leg ladder antiferromagnet C9H18N2CuBr4 with small Ising anisotropy

ORAL

Abstract

We present the high-resolution neutron scattering study in magnetic fields applied perpendicular to an easy-axis (Ising type) on the $S=$1/2 coupled two-leg ladder antiferromagnet (dimethylammonium)(3,5-dimethylpyridinium)CuBr$_{\mathrm{4}}$. At finite fields, the magnetic structure becomes noncollinear canted and the observed intriguing spontaneous magnon decays over a large region of Brillouin Zone in the excitation spectra can be well explained by the mechanism where the process of one-magnon decays into two-magnon continuum is kinematically allowed [1]. [1] M. E. Zhitomirsky and A. L. Chernyshev, Rev. Mod. Phys. \textbf{85}, 219 (2013).

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Authors

  • Tao Hong

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory

  • Y. Qiu

    • National Institute of Standards and Technology

  • D. A. Tennant

    • Quantum Condensed Matter Division, Oak Ridge National Laboratory

  • K. Coester

    • Lehrstuhl f¨ur Theoretische Physik I, TU Dortmund

  • K. P. Schmidt

    • Lehrstuhl f¨ur Theoretische Physik I, TU Dortmund

  • F. F. Awwadi

    • Department of Chemistry, The University of Jordan

  • M. M. Turnbull

    • Carlson School of Chemistry, Clark University