Longitudinal spin relaxation in simple stochastic models for disordered systems

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dc.identifier.uri http://dx.doi.org/10.15488/2231
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/2257
dc.contributor.author Borgs, P.
dc.contributor.author Kehr, K.W.
dc.contributor.author Heitjans, Paul
dc.date.accessioned 2017-11-10T17:19:18Z
dc.date.available 2017-11-10T17:19:18Z
dc.date.issued 1995
dc.identifier.citation Borgs, P.; Kehr, K.W.; Heitjans, P.: Longitudinal spin relaxation in simple stochastic models for disordered systems. In: Physical Review B 52 (1995), Nr. 9, S. 6668-6683. DOI: https://doi.org/10.1103/PhysRevB.52.6668
dc.description.abstract The relaxation of single probe spins was investigated for simple models of systems with quenched disorder. The spin relaxation was calculated for a two-site model with arbitrarily oriented magnetic fields and the result was averaged over various distributions of the fields, and of the hopping rates of the spin. On an intermediate time scale, a modified Kubo-Toyabe behavior is obtained for large hopping rates, in agreement with recent SR experiments. A stretched-exponential decay of the spin polarization is obtained at longer times. The Kohlrausch exponent is found to be field and hopping-rate dependent, in qualitative agreement with recent NMR and -NMR experiments. The resulting longitudinal relaxation rate still does not show the significant deviations from the Bloembergen-Purcell-Pound (BPP) behavior that are typical for glassy systems. Therefore, the random two-frequency model was extended to include time-dependent renewals of the environment. This modification may yield asymmetric peaks for the longitudinal relaxation rate in the BPP plot for very large renewal rates. © 1995 The American Physical Society. eng
dc.language.iso eng
dc.publisher College Park, ML : American Physical Society
dc.relation.ispartofseries Physical Review B 52 (1995), Nr. 9
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
dc.subject Nuclear Magnetic Resonance (NMR) eng
dc.subject.ddc 530 | Physik ger
dc.title Longitudinal spin relaxation in simple stochastic models for disordered systems
dc.type article
dc.type Text
dc.relation.issn 01631829
dc.relation.doi https://doi.org/10.1103/PhysRevB.52.6668
dc.bibliographicCitation.issue 9
dc.bibliographicCitation.volume 52
dc.bibliographicCitation.firstPage 6668
dc.bibliographicCitation.lastPage 6683
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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