Abstract
We have measured the temperature dependence of the nuclear spin-lattice relaxation rate $\frac{1}{{T}_{1}}$ and the nuclear spin-spin relaxation rate $\frac{1}{{T}_{2G}}$ due to indirect nuclear coupling for $^{63}\mathrm{Cu}$ NQR in the spin-Peierls (SP) compound CuGe${\mathrm{O}}_{3}$, which undergoes the SP transition at ${T}_{\mathrm{SP}}\ensuremath{\sim}14$ K, using a single crystal. We perform a combined analysis of $\frac{1}{{T}_{1}}$ and $\frac{1}{{T}_{2G}}$ on the basis of theoretical results recently obtained for the $S=\frac{1}{2}$ one-dimensional Heisenberg antiferromagnet (IDHAF) model to clarify the spin dynamics. Consequently we find that the spin dynamics above ${T}_{\mathrm{SP}}$ in CuGe${\mathrm{O}}_{3}$ is not described by the pure $S=\frac{1}{2}$ IDHAF model.
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