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Environment Effects on Electronic Density of States in Narrow‐Band Alloys Using the Cluster‐Bethe‐Lattice Method
Author(s) -
Maiti P. B.,
Moitra R. K.
Publication year - 1980
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221010220
Subject(s) - bethe lattice , alloy , lattice (music) , condensed matter physics , cluster (spacecraft) , density of states , electronic structure , materials science , coherent potential approximation , lattice constant , electronic band structure , physics , quantum mechanics , metallurgy , computer science , diffraction , acoustics , ising model , programming language
The cluster‐Bethe‐lattice method is used to study the environment effects on the electronic density of states in narrow‐band alloys. The intra‐atomic Coulomb interaction, U , is treated in the statistical (0, 1) approximation and the coherent potential approximation is used for the alloy disorder. These approximations lead us to consider the alloy system as a quaternary alloy. A general approach for an n ‐component alloy in the Bethe lattice is presented using Yonezawa's approach. It is shown that the result obtained gives the result of Yonezawa in the limit z → ∞, z being the coordination number of the alloy system. The quaternary alloy is then treated as a special case of an n‐component alloy. A cluster consisting of (Z + 1) atoms is chosen to study environment effects. A comparison is made between the electronic density of states for the Bethe lattice and that for the cluster‐Bethe lattice. Interesting features in the electronic density of states are observed due to clustering effects.