Abstract
The proton spin-lattice relaxation time T 1 in the Haldane-gap system, Ni(C 2 H 8 N 2 ) 2 NO 2 (ClO 4 ) was measured down to 0.5 K. The development of antiferromagnetic short range order was not found even at low temperatures. A relaxation process of activation type with an energy gap of 11 K has been observed.
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