Abstract
We measured temperature and Larmor frequency(ω) dependences of the 1H NMR spin-lattice relaxation time T 1 in solid Ni 2(CH 3CS 2) 4I which contains the one-dimensional(1-D) chain of -Ni-Ni-I-Ni-Ni-I- with no Peierls distortion. Almost temperature independent T 1 values of ca. 180 ms observed at ω = 40.98 MHz and in the range of 90–300 K are attributable to the relaxation due to the fluctuation of antiferromagnetically coupled unpaired electron spin formed at each -X-Ni-Ni- unit in consistent with the 1-D Mott-Hubbard type structure. T 1 in this temperature range showed the Larmor frequency dependence of ω 1 2 explainable by rapid spin diffusion along the 1-D chain. Applying the Devreux's treatment on the low-dimensional spin dynamics, the diffusion rate and activation energy for the 1-D hopping of electron spins were evaluated.
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