Anisotropic Spin Fluctuations in the Quasi One-Dimensional Frustrated Magnet LiCuVO<sub>4</sub>

DOI DOI Web Site 被引用文献25件 参考文献31件 オープンアクセス
  • Kazuhiro Nawa
    Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • Masashi Takigawa
    Institute of Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • Makoto Yoshida
    Institute of Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • Kazuyoshi Yoshimura
    Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

書誌事項

公開日
2013-09-15
資源種別
journal article
DOI
  • 10.7566/jpsj.82.094709
  • 10.48550/arxiv.1307.2346
公開者
Physical Society of Japan

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説明

We report results of NMR experiments on a single crystal of the quasi one-dimensional frustrated magnet LiCuVO_4. The NMR spectra of ^7Li and ^{51}V 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/T_1 at ^{51}V 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/T_1 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.

14 pages, 7 figures, 3 tables, accepted for publication in J. Phys. Soc. Jpn

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