Spin Diffusion in the S=1/2 Quasi One-Dimensional Antiferromagnet α-VO(PO_3)_2 via 31P NMR
arXiv:cond-mat/0102365 · doi:10.1143/JPSJ.70.2765
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 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.
9 pages, 11 embedded eps figures uses JPSJ.sty, revised for publication in J. Phys. Soc. Jpn
Cited by in corpus (9)
- Conservation laws, integrability and transport in one-dimensional quantum systems
- Evidence for Ballistic Thermal Conduction in the One-Dimensional S=1/2 Heisenberg Antiferromagnetic Spin System Sr2CuO3
- Strong frustration due to competing ferromagnetic and antiferromagnetic interactions: magnetic properties of M(VO)2(PO4)2 (M = Ca and Sr)
- Electronic and magnetic properties of KCuPO - a model S=1/2 Heisenberg chain system
- Low temperature dynamics of nonlinear Luttinger liquids
- Spin-distribution functionals and correlation energy of the Heisenberg model
- Evidence for multimagnon-mediated nuclear spin relaxation in the intertwining double-cain ferrimagnet
- Magnetic excitations in an ionic spin-chain system with a non-magnetic ferroelectric instability
- Charge ordering and ferrimagnetism in the strongly correlated -VPO single crystal