Local-environment effect on the nitrogen bound state inGaPxAs1−xalloys: Experiments and coherent-potential approximation theory

1980 ◽  
Vol 21 (12) ◽  
pp. 5706-5716 ◽  
Author(s):  
H. Mariette ◽  
J. Chevallier ◽  
P. Leroux-Hugon
Keyword(s):  
Approximation Theory ◽  
Local Environment ◽  
Bound State ◽  
Coherent Potential Approximation ◽  
Potential Approximation ◽  
Environment Effect

AN AUGMENTED SPACE-BASED CLUSTER COHERENT POTENTIAL APPROXIMATION: APPLICATION TO CuAu AND NiAl ALLOYS

2011 ◽  
Vol 25 (05) ◽  
pp. 735-745
Author(s):  
MOSHIOUR RAHAMAN ◽  
ABHIJIT MOOKERJEE
Keyword(s):  
Magnetic Properties ◽  
Tight Binding ◽  
Local Environment ◽  
Coherent Potential Approximation ◽  
Orbital Method ◽  
Potential Approximation ◽  
Augmented Space ◽  
Space Formalism ◽  
Random Alloys ◽  
Linear Muffin Tin Orbital

We use cluster generalization of the coherent potential approximation in the tight-binding linear muffin-tin orbital method to account for the effect of the local environment on electronic and magnetic properties of substitutional random alloys. This theory combines the augmented space formalism and conventional tight-binding linear muffin-tin orbital methods. In particular, we shall apply the technique to the bcc-based NiAl and fcc-based CuAu alloys and also compare with other approaches.

The Magnetic Properties of Disordered Transition Metal Alloys Using the Coherent Potential Approximation and Related Methods

1974 ◽  
Vol 52 (22) ◽  
pp. 2177-2209 ◽  
Author(s):  
M. J. Zuckermann
Keyword(s):  
Transition Metal ◽  
Magnetic Transition ◽  
Local Environment ◽  
Coherent Potential Approximation ◽  
Metal Alloys ◽  
Electronic Charge ◽  
Band Model ◽  
Magnetic Alloys ◽  
Potential Approximation ◽  
Transition Metal Alloys

For many years the properties of magnetic transition metal alloys were analyzed in terms of a rigid band model and the Stoner theory for magnetism in itinerant systems. Recently the introduction of the coherent potential approximation (CPA) has resulted in a description of the band structure of metallic alloys in terms of a local electronic charge density of states. The CPA and related approximations are derived in detail in this article and it is shown how these approximations have been extended to describe the properties of magnetic transition metal alloys in terms of local electronic spin densities. Both the statics and dynamics of itinerant magnetic alloys are discussed and the comparison with experiment is examined in detail. The article is concluded with a description of possible improvements to the CPA for magnetic alloys in particular for local environment effects.

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