Approximation of the Blume’s stochastic model by asymptotic models for PAC relaxation analysis

Oxygen Diffusion in YBa2Cu3O7–δ Studied via 133Ba(EC)133Cs Nuclear Quadrupole Interaction

“…All spectra exhibit a baseline shift which is probably due to selfabsorption in the sample. The spectrum for YBa 2 Cu 3 0 6 + £ exhibits axial symmetry (rj = 0), whereas the spectrum for YBa 2 Cu 3 0 7 _ ä has Y\ -0.41 (5). This is in qualitative agreement with the results obtained by NQR on 135 Another feature which is clearly visible in Fig.…”

“…The zero A c is characteristic for a static NQI at 300 K; the increase of X c is typical for a fluctuating EFG -superimposed to a static contributionat intermediate temperatures; the final decrease of A C to zero is a sign for complete motional narrowing at the highest temperatures. In principle it should be possible to derive hopping rates from a In A C VS. \/T plot as discussed in [5], However, the accuracy of the present data is not sufficient to render such an approach meaningful. Therefore we adopted a different procedure.…”

Impurity Centers in Oxides Investigated by γ-γ Perturbed Angular Correlation Spectroscopy and <i>Ab Initio</i> Calculations

“…The data given above correspond to the first possibility. In the case of a slow fluctuation of the QI, the perturbation factor can be approximated [61,124] by Eq.1. Although Forker et al made an extensive and intensive study of n-HfO 2 , using non-coated and alumina coated nanoparticles, produced using different precursors, and complementing the experiments with studies of n-ZrO 2 , we will restrict the present description to the case of bare nHfO 2 (as powder or pellets).…”

Dynamic off-centering of Cr3+ions and short-range magneto-electric clusters in CdCr2S4Oliveira1, Pereira2, Lopes3 et al. 2012Phys. Rev. B271170View full textAdd to dashboardCite

“…This increased damping of the R(t) spectra is attributed to timedependent interactions 24 , i.e., EFG fluctuations within the PAC timescale (1 µs> τ > 1 ns; τ -characteristic fluctuation time). 25 This effect can be modeled by including a dynamic attenuation parameter (λ) in the standard static fit function 25 (as introduced in Eq. 5).…”