NMR study of trialuminide intermetallics

被引：31

作者：

Lue, CS ^{[1
]}

Chepin, S ^{[1
]}

Chepin, J ^{[1
]}

Ross, JH ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

来源：

PHYSICAL REVIEW B | 1998年 / 57卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.57.7010

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a systematic study of the DO22-structure trialuminide intermetallic alloys using Al-27 NMR spectroscopy. The quadrupole splittings, Knight shifts, and spin-lattice relaxation times on Al3Ti, Al3V, Al3Nb, and Al3Ta 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 Tl'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 ab plane bonding configuration. Local-moment magnetism is found in Al3V, yet electrically this material appears very similar to the other DO22 aluminides.

引用

页码：7010 / 7014

页数：5

共 28 条

[1] THEORETICAL AND EXPERIMENTAL-STUDY OF RELAXATIONS IN AL3TI AND AL3ZR ORDERED PHASES [J].