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7Li-NMR Study of Spin Liquid State Due to Orbital Fluctuation in LiNiO2

We report magnetic field ( H ) effect on the unconventional magnetism in LiNiO 2 that consists of a spin-1/2 triangular (TRI) lattice through the 7 Li nuclear spin lattice relaxation (1/ T 1 ) and NMR intensity measurements. Instead of a ferromagnetic (FM) ground state expected from the FM-Weiss constant, a marginal ordered state emerges below T M ∼20 K, evidenced from the wipe-out effect of 7 Li-NMR signal and the divergent behavior of 1/ T 1 towards T M . 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 J AF 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 ω ex ∼11 K, co...