Spin dynamics in the impurity-doped one-dimensional heisenberg paramagnet (CH3)4NMn(1-x)CuXCl3: Nuclear magnetic relaxation |
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Authors: | Y Nakajima Y Ajiro Y Furukawa H Kiriyama |
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Institution: | Department of Chemistry, Kyoto University, Kyoto 606, Japan;Institute of Scientific and Industrial Research, Osaka University, Osaka 565, Japan |
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Abstract: | Proton spin-lattice relaxation rate has been measured at room temperature in the impurity-doped (CH3)4NMn(1-x)CuxCl3 for X = 0.04, 0.1 and 0.17. The result for Hz. snfc;chain-axis as a function of resonance frequency clearly shows that the spectral density of the spin fluctuations in the impure system remains to have the characteristics 1-D diffusive term (ω-), with a slower rate of the spin diffusion in accordance with the theory by Richards. The result for H⊥ chain-axis indicates, however, the existence of a singularity of the fluctuations near ω = 0. |
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