Deuterium NMR spectra of LuD3 were obtained at 8.0 and 8.4 T from 163 to 398 K, revealing only minor changes with temperature. The resonance has an outer, uniaxially symmetric quadrupolar doublet, arising from Dm atoms in the unit cell. An inner resonance with quadrupolar asymmetry η=0.68 and approximately twice the intensity is assigned to the nominally tetrahedral Dt atoms. Using partial alignment of the powder particles in the magnetic field and subsequent freezing in wax, the NMR line shape has been studied as a function of field direction, allowing the orientation of the η≠0 electric-field-gradient tensor to be partly determined. In addition, the agreement of the aligned line shapes with simulations confirms that the spectrum has only two components, from Dm and Dt atoms; specifically, there is no evidence for two subgroups of Dt atoms. The decays of two-pulse echoes and three-pulse spin-alignment echoes indicate fluctuations in the quadrupole splittings due to atomic motions. The spin-lattice relaxation rate R1 above 300 K is an approximately thermally activated function of temperature; in this region R1 is determined by atomic diffusion to relaxation centers. Comparisons are made between the 2D NMR behaviors of LuD3 and YD3.
|Original language||English (US)|
|Number of pages||8|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - May 1 2003|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics