Abstract
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 language | English |
---|---|
Pages (from-to) | 3703-3706 |
Number of pages | 4 |
Journal | journal of the physical society of japan |
Volume | 67 |
Issue number | 11 |
DOIs | |
Publication status | Published - 1998 |
Externally published | Yes |
Keywords
- NMR
- orbital degree of freedom
- quantum spin system
- resonating valence bond
- specific heatm
- triangular lattice
ASJC Scopus subject areas
- Physics and Astronomy(all)