Nuclear spin diffusion and paramagnetic spin dynamics in rare earth doped phosphate glasses
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31P NMR measurements been used to study the dynamics of rare earth ions in heavily doped phosphate laser glasses at temperatures between 2 K and 100 K. A model has been developed which describes nuclear spin lattice relaxation and linewidth broadening in terms of coupling of the electronic and nuclear magnetic moments. At low temperatures the local fields due to the paramagnetic ions cause significant broadening of the31P resonance line. The local fields establish large regions within the samples in which nuclear spin diffusion is impossible. Electronic relaxation parameters and crystal field splittings in the rare earth ions have been inferred from the NMR relaxation data.
KeywordsElectron Paramagnetic Resonance Electronic Relaxation Nuclear Magnetic Moment Crystal Field Splitting Paramagnetic Spin
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