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We have measured the decay of NMR multiple quantum coherence intensities bothunder the internal dipolar Hamiltonian as well as when this interaction iseffectively averaged to zero, in the cubic calcium fluoride (CaF2) spin systemand the pseudo one-dimensional system of fluoroapatite. In calcium fluoride thedecay rates depend both on the number of correlated spins in the cluster, aswell as on the coherence number. For smaller clusters, the decays dependstrongly on coherence number, but this dependence weakens as the size of thecluster increases. The same scaling was observed when the coherencedistribution was measured in both the usual Zeeman or z basis and the x basis.The coherence decay in the one dimensional fluoroapatite system did not changesignificantly as a function of the multiple quantum growth time, in contrast tothe calcium fluoride case. While the growth of coherence orders is severelyrestricted in this case, the number of correlated spins should continue togrow, albeit more slowly. All coherence intensities were observed to decay asGaussian functions in time. In all cases the standard deviation of the observeddecay appeared to scale linearly with coherence number.Comment: 7 pages, 9 figures. submitted to PR

physical review. b, condensed matter and materials physics

Decay of highly correlated spin states in a dipolar-coupled solid: NMR study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi><mml:msub><mml:mi mathvariant="normal">F</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Decay of highly correlated spin states in a dipolar-coupled solid: NMR study ofCaF2