Nuclear Magnetic Resonance Study on Pseudo One-Dimensional Antiferromagnet LiCuVO4.

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  • Tanaka Takaaki
    Graduate School of Science and Technology, and Faculty of Science, Kobe University, Nada, Kobe 657-8501
  • Ishida Hiroaki
    Graduate School of Science and Technology, and Faculty of Science, Kobe University, Nada, Kobe 657-8501
  • Matsumoto Masayuki
    Graduate School of Science and Technology, and Faculty of Science, Kobe University, Nada, Kobe 657-8501
  • Wada Shinji
    Graduate School of Science and Technology, and Faculty of Science, Kobe University, Nada, Kobe 657-8501

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Other Title
  • Nuclear Magnetic Resonance Study on Pseudo One-Dimensional Antiferromagnet LiCuVO<sub>4</sub>
Published
2002
DOI
  • 10.1143/jpsj.71.308
Publisher
THE PHYSICAL SOCIETY OF JAPAN

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Description

The electronic and magnetic states of a pseudo one-dimensional (1D) antiferromagnet LiCuVO4 (TN=3.3 K), which consists of distorted CuO6 linear chains, have been investigated microscopically with nuclear magnetic resonance measurements. The characteristic of the 1D antiferromagnetic (AF) spin=1/2 chains appears in a broad extremum of the resonance shift K for each of 65Cu, 51V and 7Li at the temperatures around TM=28 K, which can reasonably be compared with the Bonner-Fisher-type behavior of the susceptibility χ. From the linear dependence of K on χ, the hyperfine field for each of 65Cu, 51V and 7Li is estimated as ∼20, 5.6 and -0.25 kOe/μB, respectively, indicating that the magnetism originates from Cu2+ ions on the octahedral B sites. The nuclear spin-lattice relaxation rate T1-1 of 51V on the tetrahedral A sites has somewhat complex temperature dependence, which can not simply be explained by the scaling theories for the standard AF spin=1/2 chain. A broad T1-1 maximum observed around 80 K and an upturn below ∼15 K are ascribed to the development of 1D and 2D or 3D AF short-range orderings at rather high temperatures well above TM and TN, respectively.

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