Li-NMR study of Spin liquid state due to orbital fluctuation in LiNio 2

Tatsuya Fujimoto, Guo Qing Zheng, Yoshio Kitaoka, Atsushi Hirano, Ryoji Kanno, Mikio Takano

Research output: Contribution to journalArticlepeer-review


We report magnetic field (H) effect on the unconventional magnetism in LiNiO2 that consists of a spin-1/2 triangular (TRI) lattice through the 7Li nuclear spin lattice relaxation (1/T1) and NMR intensity measurements. Instead of a ferromagnetic (FM) ground state expected from the FM-Weiss constant, a marginal ordered state emerges below TM sim 20 K, evidenced from the wipe-out effect of 7Li-NMR signal and the divergent behavior of 1/T1 towards TM- The existence of the strong antiferromagnetic (AF) interaction along with the FM one is concluded to lead to a magnetically frustrated state at low temperatures and its AF exchange constant JAF is estimated to be about -20 K. This marginal ordered state due to the frustration of the antiferro-orbital order is found to be suppressed by applying H exceeding 10 T, revealing an orbital exchange constant J° ∼ -10 K. In the paramagnetic regime at high temperatures, the system behaves like an assembly of local moments with an exchange frequency wex sim 11 K, consistent with the energy scale of \J°;\∼10 K. The present experiments have revealed that | J°\ ∼ 10 K is lower than spin exchange constants JFM ∼ 30 K, \J AF\ ∼ 20 K.

Original languageEnglish
Pages (from-to)169-171
Number of pages3
Journaljournal of the physical society of japan
Issue numberSUPPL.
Publication statusPublished - 2002
Externally publishedYes


  • Frustration
  • NMR
  • Orbital degrees of freedom
  • Spin liquid state
  • Triangular lattice

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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