Electron Spin Dynamics in a Spin 1/2 One-Dimensional Heisenberg Antiferromagnet [CuX2(AdH+)2]X2

Abstract

Electron spin dynamics on a spin 1/2 one-dimensional Heisenberg antiferromagnet, [CuX 2 (AdH + ) 2 )X 2 (X : Cl, Br; Ad : adenine) was studied by 1 H NMR spin-lattice relaxation measurement. 1 H T 1 of [CuBr 2 (AdH + ) 2 ]Br 2 (J = 52.6 K) in the low-temperature region below 25 K was well described by the spin fluctuation relaxation theory proposed by Sachdev.