TEMPERATURE-DEPENDENT NMR FEATURES OF THE AL65CU20RU15 ICOSAHEDRAL ALLOY

被引：32
作者：
HILL, EA
CHANG, TC
WU, Y
POON, SJ
PIERCE, FS
STADNIK, ZM
机构：
[1] UNIV N CAROLINA,DEPT PHYS & ASTRON,CHAPEL HILL,NC 27599
[2] UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901
[3] UNIV OTTAWA,DEPT PHYS,OTTAWA K1N 6N5,ONTARIO,CANADA
来源：
PHYSICAL REVIEW B | 1994年 / 49卷 / 13期
关键词：
D O I：
10.1103/PhysRevB.49.8615
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The Al65Cu20Ru15 icosahedral alloy was studied by Al-27 nuclear magnetic resonance from 150 to 1110 K. The Knight shift of the unresolved resonance line was observed to significantly increase above 500 K. This uncommon temperature dependence of the Knight shift is interpreted in terms of the presence of a pseudogap at the Fermi level. The spin-lattice relaxation rate deviates from the linear temperature dependence of Korringa relaxation below 500 K, and above 500 K it is dominated by a thermally activated process with a small activation energy of 0.48 eV. This energy is distinctly different from the activation energy observed in simple metallic alloys.
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页码：8615 / 8620
页数：6
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