Density of states and dc electrical conductivity in an order-disorder ternary alloy in a generalized coherent-potential approximation

1991 ◽  
Vol 44 (9) ◽  
pp. 4135-4145
Author(s):  
William Karstens ◽  
Leonard M. Scarfone
Keyword(s):  
Electrical Conductivity ◽  
Ternary Alloy ◽  
Density Of States ◽  
Coherent Potential Approximation ◽  
Potential Approximation ◽  
Dc Electrical Conductivity

Density of States of Co- and Cr-Doped Ni2.0Mn1.5Sn0.5 Heusler Alloys

2016 ◽  
Vol 845 ◽  
pp. 162-165
Author(s):  
Mikhail A. Zagrebin ◽  
Vladimir V. Sokolovskiy ◽  
Vasiliy D. Buchelnikov ◽  
Marina A. Klyuchnikova
Keyword(s):  
Spin Polarization ◽  
Density Of States ◽  
Magnetic Moment ◽  
First Principles ◽  
Heusler Alloys ◽  
Coherent Potential Approximation ◽  
First Principles Calculations ◽  
Potential Approximation ◽  
Co Concentration ◽  
Co Concentrations

The composition dependences of the density of states in Co- and Cr-doped Ni-Mn-Sn Heusler alloys are investigated by using first principles calculations. The off-stoichiometric compositions are realized by the coherent-potential approximation. We have shown that the spin polarization decreases with increasing Cr and Co concentrations. While, the total magnetic moment was found to decrease (increase) with increasing Cr (Co) concentration, respectively.

scholarly journals Absorption Spectrum and Density of States of Square, Rectangular, and Triangular Frenkel Exciton Systems with Gaussian Diagonal Disorder

2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
Ibrahim Avgin ◽  
David Huber
Keyword(s):  
Density Of States ◽  
Nearest Neighbor ◽  
Elliptic Integral ◽  
Coherent Potential Approximation ◽  
Square Lattice ◽  
Integral Approach ◽  
Frenkel Exciton ◽  
Potential Approximation ◽  
Effects Of Disorder ◽  
Diagonal Disorder

Using the coherent potential approximation, we investigate the effects of disorder on the optical absorption and the density of states of Frenkel exciton systems on square, rectangular, and triangular lattices with nearest-neighbor interactions and a Gaussian distribution of transition energies. The analysis is based on an elliptic integral approach that gives results over the entire spectrum. The results for the square lattice are in good agreement with the finite-array calculations of Schreiber and Toyozawa. Our findings suggest that the coherent potential approximation can be useful in interpreting the optical properties of two-dimensional systems with dominant nearest-neighbor interactions and Gaussian diagonal disorder provided the optically active states are Frenkel excitons.

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