NMR study of trialuminide intermetallics
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We present a systematic study of the (Formula presented)-structure trialuminide intermetallic alloys using (Formula presented) NMR spectroscopy. The quadrupole splittings, Knight shifts, and spin-lattice relaxation times on (Formula presented), (Formula presented), (Formula presented), and (Formula presented) have been identified. Knight-shift tensors were isolated by observation of quadrupole satellite lines and fitting to the central-transition powder patterns. The results are associated with the local electronic density of states for each crystallographic site. Universally small isotropic Knight shifts and long (Formula presented)s are consistent with low Fermi-surface densities of states indicating the importance of Fermi-surface features for the phase stability of these alloys. Larger anisotropic Knight shifts occurring at aluminum site I indicate strong hybridization at this site, and the electric-field-gradient tensors confirm the strong (Formula presented) plane bonding configuration. Local-moment magnetism is found in (Formula presented), yet electrically this material appears very similar to the other (Formula presented) aluminides. 1998 The American Physical Society.
author list (cited authors)
Lue, C., Chepin, S., Chepin, J., & Ross, J. H