Abstract
$^{63,65}\mathrm{Cu}$ NMR measurements have been performed to study Knight shift and electric-field gradient (EFG) tensors in the spin-Peierls (SP) compound ${\mathrm{CuGeO}}_{3}$, which undergoes the SP transition at ${\mathit{T}}_{\mathrm{SP}}$\ensuremath{\sim}14 K, using a single crystal. From the numerical analysis of the $^{63,65}\mathrm{Cu}$ NMR spectra based on a nuclear Hamiltonian including Zeeman and electric quadrupole interactions, we have precisely determined the principal values and axes of the Knight shift and EFG tensors. Based on theses results, the orbital susceptibility and hyperfine interaction are discussed within a ${\mathrm{Cu}}^{2+}$ single-ion model in a rhombic crystal field. Consequently, the crystal field parameters are obtained. \textcopyright{}1996 The American Physical Society.
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