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- W2061822118 abstract "$^{63,65}mathrm{Cu}$ NMR and NQR measurements have been performed to study the ${mathrm{Cu}}^{2+}$ electronic state and the spin dynamics in ${mathrm{CuGeO}}_{3}$, which is an inorganic compound that undergoes the spin-Peierls transition at ${mathit{T}}_{mathrm{sp}}$ensuremath{sim}14 K. The NQR frequency is discussed in connection with the lattice dimerization accompanied by the spin-Peierls transition. The Knight shift with an axial symmetry showed the temperature dependence corresponding to the reduction of the spin susceptibility. From the analysis of the Knight shift and the magnetic susceptibility, orbital and spin susceptibilities are evaluated. The analysis of the hyperfine structure leads to a conclusion that the electronic state of the ${mathrm{Cu}}^{2+}$ ion above ${mathit{T}}_{mathrm{sp}}$ is described by a single-ion model in a crystal field with a tetragonal symmetry. The supertransferred hyperfine interaction, which is one of the characteristic features of ${mathrm{Cu}}^{2+}$ ions in the ${mathrm{CuO}}_{2}$ plane in the high-${mathit{T}}_{mathit{c}}$ superconducting copper oxides, is found not to play an important role in ${mathrm{CuGeO}}_{3}$. The temperature dependence of the nuclear spin-lattice relaxation rate 1/${mathit{T}}_{1}$ clearly shows presence of a gap in the magnetic excitation spectrum below ${mathit{T}}_{mathrm{sp}}$. The relaxation mechanism is discussed based on the spinless fermion treatment for an S=1/2 one-dimensional Heisenberg antiferromagnet (1DHAF) above ${mathit{T}}_{mathrm{sp}}$ and for a nonuniform S=1/2 1DHAF with two unequal and alternating exchange interactions below ${mathit{T}}_{mathrm{sp}}$. Above ${mathit{T}}_{mathrm{sp}}$, it is also discussed in terms of the dynamical susceptibilty of the 1DHAF." @default.
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- W2061822118 doi "https://doi.org/10.1103/physrevb.52.3410" @default.
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