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Spin Diffusion in the S=1/2 Quasi One-Dimensional Antiferromagnet alpha-VO(PO_3)_2 via 31P NMR | | Jun Kikuchi
; Naohiko Kurata
; Kiyoichiro Motoya
; Touru Yamauchi
; Yutaka Ueda
; | | Date: |
21 Feb 2001 | | Journal: | J. Phys. Soc. Jpn. 70, 2765 (2001) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | 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. | | Source: | arXiv, cond-mat/0102365 | | Services: | Forum | Review | PDF | Favorites | |
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