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 language | English |
|---|---|
| Pages (from-to) | 439-444 |
| Number of pages | 6 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 55 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Jan 1997 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics