ELECTRON MOMENTUM DENSITY IN DISORDERED MUFFIN-TIN CU1-XNIX IN THE AVERAGE-T-MATRIX APPROXIMATION

被引:22
作者
MIJNARENDS, PE [1 ]
BANSIL, A [1 ]
机构
[1] NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115
来源
PHYSICAL REVIEW B | 1979年 / 19卷 / 06期
关键词
D O I
10.1103/PhysRevB.19.2912
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In an earlier article we discussed the formalism for evaluating the average electron-momentum density in a random binary alloy by using the average-t-matrix approximation to treat the disorder and muffin-tin potentials to represent the constituent atoms. The present paper considers the application of this formalism to Cu1-xNix over a range of alloy compositions. The characteristic effects of disorder on the spectral momentum density ρ(p→,E) are delineated. In discussing the momentum density ρ(p→) we focus on how this quantity changes as x increases from 0 to 1 and the Ni d band develops from a virtual bound state below the Fermi energy into a transition-metal d band interacting the Fermi energy. Our detailed predictions in this regard should be amenable to experimental verification by two-dimensional positron-annihilation experiments. © 1979 The American Physical Society.
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页码:2912 / 2918
页数:7
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