Extended-range propagated order in amorphous solids
Extended-range propagated order in amorphous solids
复制标题
非晶固体中的扩展范围传播序
DOI：
--
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
S. Elliott
中科院分区：
文献类型：
--
作者：
A. Uhlherr;S. Elliott
在非晶硅（a-Si）的大模型（13824个原子）中发现了原子密度的涨落，涨落范围至少为35 AA。这种扩展范围的结构秩序已被发现，在a-Si的情况下，产生于第二相邻的相关性优先传播原子密度波动。在a-Si的情况下，这种低振幅、扩展范围的原子密度振荡的周期（即约=3.4 Δ A）与第一尖锐衍射峰（FSDP）的位置相关，即约=1.9 Δ A-1;事实上，r>10 AA的扩展实空间波动对FSDP强度的贡献几乎与更强但周期性更小的波动一样显着，相关性在0-10 AA范围内。
Atomic density fluctuations, extending to at least 35 AA, have been discovered in a large (13824 atom) model of amorphous silicon (a-Si). This extended-range structural order has been found, in the case of a-Si, to arise from second-neighbour correlations preferentially propagating atomic-density fluctuations. The period of such low-amplitude, extended-range oscillations in atomic density, namely approximately=3.4 AA in the case of a-Si, is that associated with the position of the first sharp diffraction peak (FSDP), namely approximately=1.9 AA-1; indeed, the extended real-space fluctuations for r>10 AA contribute almost as significantly to the intensity of the FSDP as do the much stronger, but less periodic, correlations in the range 0-10 AA.