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Spin Diffusion in the S=1/2 Quasi One-Dimensional Antiferromagnet ��-VO(PO_3)_2 via 31P NMR
- Publication Year :
- 2001
- Publisher :
- arXiv, 2001.
-
Abstract
- Low-frequency spin dynamics in the S=1/2 antiferromagnetic spin-chain compound ��-VO(PO_3)_2 has been studied by means of 31P 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 \approx 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 \pm 0.01 K.<br />9 pages, 11 embedded eps figures uses JPSJ.sty, revised for publication in J. Phys. Soc. Jpn
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi...........ef67809451b3c18f7824aa64deefbec3
- Full Text :
- https://doi.org/10.48550/arxiv.cond-mat/0102365