Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-02-21
J. Phys. Soc. Jpn. 70, 2765 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 11 embedded eps figures uses JPSJ.sty, revised for publication in J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.70.2765
Low-frequency spin dynamics in the S=1/2 antiferromagnetic spin-chain compound \alpha-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.
Kikuchi Jun
Kurata Naohiko
Motoya Kiyoichiro
Ueda Yutaka
Yamauchi Touru
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