7Li NMR Studies of LiCrO2

Abstract

We report on 7Li NMR studies of a spin S = 3/2 triangular lattice antiferromagnet LiCrO2 (Neel temperature TN = 62 K) in the paramagnetic state by using the free-induction decay of 7Li nuclear magnetization. We observed critical divergence of the 7Li nuclear spin-lattice relaxation rate 1/T1 near TN, a narrow critical region, and a critical exponent w = 0.45 from a fit of 1/T1 $\propto$ (T/TN - 1)${}^{-w}$. Although spin frustration effects have been explored for this system, the dynamical critical phenomena suggest that LiCrO2 in the critical region is a poor low dimensional antiferromagnetic system.

6 pages, 4 figures, to appear in JPS Conf. Proc. (SCES2013)

References in corpus (3)

• Spin dynamics and spin freezing behavior in the two-dimensional antiferromagnet NiGa${}_2$S${}_4$ revealed by Ga-NMR, NQR and $\mu$SR measurements
• Spin-stiffness and topological defects in two-dimensional frustrated spin systems
• Critical Slowing Down of Triangular Lattice Spin-3/2 Heisenberg Antiferromagnet Li7RuO6 via 7Li NMR