Observation of a strongly nested fermi surface in the shape-memory alloy Ni0.62Al0.38 -: art. no. 046406
Observation of a strongly nested fermi surface in the shape-memory alloy Ni0.62Al0.38 -: art. no. 046406
复制标题
DOI：
10.1103/physrevlett.96.046406
复制
发表时间：
2006-02-03
影响因子：
8.6
通讯作者：
Fort, D
中科院分区：
文献类型：
--
作者：
Dugdale, SB;Watts, RJ;Fort, D
用康普顿散射法测定了形状记忆合金Ni0.62Al0.38的费米表面拓扑结构。通过一个近似为0.18[1，1，0](2pi/a)的矢量的平移，可以使这个费米面的一大片区域与其他区域嵌套，该矢量对应于与电子衍射图中的声子软化和扩散条纹等马氏体前驱物现象相关的波矢量。这一观察结果有力地证明了这些现象是由费米面嵌套导致的电子-晶格耦合增强所驱动的。
The Fermi surface topology of the shape-memory alloy Ni0.62Al0.38 has been determined using Compton scattering. A large area of this Fermi surface can be made to nest with other areas by translation through a vector of approximate to 0.18[1,1,0](2 pi/a), which corresponds to the wave vector associated with martensitic precursor phenomena such as phonon softening and diffuse streaking in electron diffraction patterns. This observation is compelling evidence that these phenomena are driven by the enhanced electron-lattice coupling due to the Fermi surface nesting.