Study of Excitations in Structurally Incommensurately Modulated Solids by Means of Nuclear Magnetic Resonance View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2001-07-18

AUTHORS

F. Decker , U. Häcker , K. -P. Holzer , M. Irsch , D. Michel , P. Mischo , J. Petersson

ABSTRACT

The dynamics of the incommensurate (IC) modulation is investigated for several one-dimensionally incommensurately modulated crystals near the transition to the normal high temperature phase at the temperature Ti by means of quadrupolar perturbed nuclear magnetic resonance (NMR) spectra and nuclear spin-lattice relaxation. All results can be described consistently in terms of a static modulation in the IC phase without any indication for ‘floating’ or large scale fluctuations of the modulation wave. The critical exponents derived from the NMR line shape and the relaxation times T1 very nicely fit to the universality class of the 3d-XY model. For Rb2ZnBr4 and Rb2ZnCl4 crystals the characteristic frequency of the critical dynamics of the order parameter (OP) slows down below the Larmor frequency used in the 87Rb NMR relaxation time measurements. In this particular case one can derive the characteristic frequency of the critical dynamics of the OP above Ti and of the phason below Ti from the Larmor frequency dependence of T1. More... »

PAGES

565-576

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/3-540-44946-9_45

DOI

http://dx.doi.org/10.1007/3-540-44946-9_45

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1038818276


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