Dynamics of bound magnon pairs in the quasi-one-dimensional frustrated magnet LiCuVO4

K. Nawa, M. Takigawa, S. Krämer, M. Horvatić, C. Berthier, M. Yoshida, K. Yoshimura

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8 Citations (Scopus)

Abstract

We report on the dynamics of the spin-1/2 quasi-one-dimensional frustrated magnet LiCuVO4 measured by nuclear spin relaxation in high magnetic fields 10-34 T, in which the ground state has spin-density-wave order. The spin fluctuations in the paramagnetic phase exhibit striking anisotropy with respect to the magnetic field. The transverse excitation spectrum probed by V51 nuclei has an excitation gap, which increases with field. On the other hand, the gapless longitudinal fluctuations sensed by Li7 nuclei grow with lowering temperature, but tend to be suppressed with increasing field. Such anisotropic spin dynamics and its field dependence agree with the theoretical predictions and are ascribed to the formation of bound magnon pairs, a remarkable consequence of the frustration between ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions.

Original languageEnglish
Article number134423
JournalPhysical Review B
Volume96
Issue number13
DOIs
Publication statusPublished - 2017 Oct 24

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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