Anisotropic spin fluctuations in the quasi one-dimensional frustrated magnet LiCuVO4

Kazuhiro Nawa, Masashi Takigawa, Makoto Yoshida, Kazuyoshi Yoshimura

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

We report results of NMR experiments on a single crystal of the quasi one-dimensional frustrated magnet LiCuVO4. The NMR spectra of 7Li and 51V nuclei indicate a helical spin order in a magnetic field of 4 T with the helical spin plane perpendicular to the field and a spin-density-wave (SDW) order at 10 T with modulation in the magnitude of the moments aligned along the field, in agreement with earlier reports. The nuclear spin-lattice relaxation rate 1/T1 at 51V nuclei, which is selectively coupled to the transverse spin fluctuations perpendicular to the field, shows a pronounced peak near the helical ordering temperature in the field of 4 T applied along the a-axis. In the field of 10 T, however, such a peak is absent. Instead 1/T1 at 7Li nuclei probing longitudinal spin fluctuations shows divergent behavior towards the SDW ordering temperature. These results are qualitatively consistent with the theoretical description that the SDW correlation is due to bound magnon pairs, which produce an energy gap in the transverse spin excitation spectrum.

Original languageEnglish
Article number094709
Journaljournal of the physical society of japan
Volume82
Issue number9
DOIs
Publication statusPublished - 2013 Sep
Externally publishedYes

Keywords

  • A frustrated magnetic chain
  • Spin fluctuations
  • Spin-lattice relaxation rate

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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