Orbital Frustration and Resonating Valence Bond State in the Spin-1/2 Triangular Lattice LiNiO2

Yoshio Kitaoka, Tatsuo Kobayashi, Akihiro Kōda, Hayato Wakabayashi, Yoshihiro Niino, Hirokazu Yamakage, Shinichiro Taguchi, Kiichi Amaya, Tatsuo Kobayashi, Akihiro Kōda, Kazunari Yamaur, Mikio Takano, Atushi Hirano, Ryoji Kanno, Yoshio Kitaoka, Tatsuo Kobayashi, Kiichi Amaya, Mikio Takano

Research output: Contribution to journalArticlepeer-review

92 Citations (Scopus)


From the 7Li nuclear magnetic resonance (NMR) and specific heat measurements of LiNiO2, consisting of a spin-1/2 triangular lattice, it is demonstrated that the previously suggested spin-giass-like freezing below Tsg = 8K. which is caused by defects of Li ions: is not the true ground state, but rather a quantum disordered state is realized without a spin gap. This state is characterized by power-law behavior of the temperature dependence of the specific heat below 0.5 K. A spin-liquid state with short-range ferromagnetic correlations is suggested from new insight into the frustration of orbital ordering for doubly degenerate eg shells in the triangular lattice.

Original languageEnglish
Pages (from-to)3703-3706
Number of pages4
Journaljournal of the physical society of japan
Issue number11
Publication statusPublished - 1998
Externally publishedYes


  • NMR
  • orbital degree of freedom
  • quantum spin system
  • resonating valence bond
  • specific heatm
  • triangular lattice

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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