Abstract
We present a systematic study of the -structure trialuminide intermetallic alloys using NMR spectroscopy. The quadrupole splittings, Knight shifts, and spin-lattice relaxation times on , , , and 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 ’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 plane bonding configuration. Local-moment magnetism is found in , yet electrically this material appears very similar to the other aluminides.
- Received 7 July 1997
DOI:https://doi.org/10.1103/PhysRevB.57.7010
©1998 American Physical Society