Spin Dynamics in Spin-1/2 One-Dimensional Antiferromagnets at Low Temperature

Proton spin-lattice relaxation time T 1 was measured at low temperature in the typical S =1/2 one-dimensional antiferromagnets, CuCl 2 ·2NC 5 H 5 and Cu(C 6 H 5 COO) 2 ·3H 2 O. From a combined discussion with an available data of ESR line width, the weak temperature dependence (1/ T 1 ∝ T -0.25 ) is attributable to the weak divergence of the staggered spin correlation < S K 0 z S - K 0 z >, possibly being less divergent than T -0.25 .