Electron–nucleus interactions in highly doped rare earth phosphate glasses
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31P NMR measurements have been used to study the dynamics of magnetic rare earth ions in the stable metaphosphate systems (R2O3)x(X2O3)0.25-x(P2O5)0.75, with R≡Er3+, Nd3+ and Gd3+, for varying concentrations x, where X denotes a nonmagnetic rare earth buffer. Broad EPR spectra are observable at liquid helium temperatures but it is not possible to measure the paramagnetic relaxation time directly. Electronic relaxation parameters and crystal field splittings have been inferred from the NMR relaxation data. Nuclei situated near paramagnetic ion sites experience shifts in resonance frequency due to the local field produced by the ion. The nuclear resonance line is inhomogeneously broadened with decreasing temperature and disappears abruptly at temperatures which depend on the magnetic ion present, its concentration and the magnitude of the applied magnetic field. A discussion of the line broadening process is presented.
KeywordsSpin Diffusion Nucleus Interaction Lattice Relaxation Time Nuclear Resonance Moment Ratio
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