Origin of non-exponential relaxation in a crystalline ionic conductor: a multi-dimensional 109Ag NMR study
arXiv:cond-mat/0310256 · doi:10.1103/PhysRevB.69.094302
Abstract
The origin of the non-exponential relaxation of silver ions in the crystalline ion conductor Ag7P3S11 is analyzed by comparing appropriate two-time and three-time 109Ag NMR correlation functions. The non-exponentiality is due to a rate distribution, i.e., dynamic heterogeneities, rather than to an intrinsic non-exponentiality. Thus, the data give no evidence for the relevance of correlated back-and-forth jumps on the timescale of the silver relaxation.
4 pages, 3 figures