Nuclear spin-lattice relaxation of dipolar order caused by paramagnetic impurities

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30 Scopus citations

Abstract

We show that the relaxation function of the dipolar order is given by exp[-(t/(Formula presented)(Formula presented)]exp(-t/(Formula presented)) where (Formula presented) and (Formula presented) are spin-lattice relaxation times: (Formula presented) due to direct interaction of a given nuclear spin with paramagnetic centers and (Formula presented) due to indirect interaction with the paramagnetic centers through neighboring nuclear spins. For a homogeneous distribution of paramagnetic centers and nuclear spins, α=D/6 where D is the sample dimensionality. For an inhomogeneous distribution, the sample is divided into d-dimensional subsystems, each containing one paramagnetic center, yielding α=(D+d)/6. The dipolar relaxation is measured in fluorinated graphite. Data from this experiment and from (Formula presented) doped with (Formula presented) in the literature are consistent with this model.

Original languageEnglish
Pages (from-to)439-444
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number1
DOIs
StatePublished - 1 Jan 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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