Abstract
Low-frequency spin dynamics in the S =1/2 antiferromagnetic spin-chain compound α-VO(PO 3 ) 2 has been studied by means of 31 P NMR. The nuclear spin-lattice relaxation rate 1/ T 1 at the P site exhibits H -1/2 dependence on the applied magnetic field ( H ) at temperatures ( T ) well above the intrachain coupling strength J / k B = 3.50 K indicating one-dimensional diffusive spin dynamics. The diffusive contribution to 1/ T 1 decreases on cooling as electronic spins acquire short-range antiferromagnetic correlations within the chain, and vanishes almost entirely around T ≈ J / k B . This is accompanied by an apparent increase of the spin-diffusion constant from the value expected in the classical limit. On the other hand, the field-independent part of 1/ T 1 increases with decreasing temperature, which may be a precursor for the true long-range antiferromagnetic ordering found below T N = 1.93 ±0.01 K.
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