Ultraslow motion of domain wall in channel inclusion compound studied by means of NMR cross-relaxation

J. H. Krieger, A. M. Panich, A. R. Semenov

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2 Scopus citations

Abstract

We report temperature dependent 1H NMR relaxation measurements of the powder thiourea-hexachloroethane inclusion compound, [2.95(NH2)2CS]·C2Cl6, at different resonance frequencies, from 23 to 55.5 MHz. Significant reduction of spin-lattice relaxation time at 38-47 MHz is caused by the cross-relaxation of protons via the quadrupole chlorine nuclei. We conclude that the effective 1H-35Cl cross-relaxation observed in powder sample is due to a slow mode process, when the molecules of the domain wall exhibit a correlated translational and rotational motion over the channel. Such a propagation of the domain wall was predicted by atom-atomic potential calculation. We show that the NMR cross-relaxation effect is an effective tool in studying ultraslow motions, in particular in incommensurate structures.

Original languageEnglish
Pages (from-to)69-72
Number of pages4
JournalSolid State Communications
Volume120
Issue number2-3
DOIs
StatePublished - 26 Sep 2001

Keywords

  • A. disordered systems
  • A. insulators
  • E. nuclear resonances

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