Atomic Motion in Quasicrystalline Al 70 Re 8.6 Pd 21.4 : A Two-Dimensional Exchange NMR Study
Atomic Motion in Quasicrystalline Al 70 Re 8.6 Pd 21.4 : A Two-Dimensional Exchange NMR Study
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准晶 Al 70 Re 8.6 Pd 21.4 中的原子运动：二维交换核磁共振研究
DOI：
10.1103/physrevlett.81.3671
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发表时间：
1998
影响因子：
8.6
通讯作者：
H. Ott
中科院分区：
文献类型：
--
作者：
J. Dolinšek;B. Ambrosini;P. Vonlanthen;J. Gavilano;M. Chernikov;H. Ott
在27 Al 2D交换NMR实验中，在0.16 ~ 130 K的温度范围内，对二十面体Al 70 Re 8.6 Pd 21.4准晶进行了亚kHz范围内的慢原子运动检测。观察到的运动在空间上是有限的，并且可以与非常低能量的局部相子波动相关联，涉及非常低温度下的量子隧穿。因此，它可以被视为一种原子运动，作为体自扩散的前兆。
27 Al 2D exchange NMR experiments on an icosahedral Al 70 Re 8.6 Pd 21.4 quasicrystal have detected slow atomic motions in the sub-kHz range at temperatures between 0.16 and 130 K. The observed motion is limited in space and can be associated with local phason fluctuations at very low energies, involving quantum tunneling at very low temperatures. It may thus be regarded as an atomic motion acting as a precursor to bulk self-diffusion.