Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2003-04-17
Phys. Rev. B 68, 064201 (2003)
Physics
Condensed Matter
Disordered Systems and Neural Networks
9 RevTeX4 pages with 11 .eps figures included, submitted to PRB
Scientific paper
10.1103/PhysRevB.68.064201
We study the three-dimensional two-band Anderson model of localization and compare our results to experimental results for amorphous metallic alloys (AMA). Using the transfer-matrix method, we identify and characterize the metal-insulator transitions as functions of Fermi level position, band broadening due to disorder and concentration of alloy composition. The appropriate phase diagrams of regions of extended and localized electronic states are studied and qualitative agreement with AMA such as Ti-Ni and Ti-Cu metallic glasses is found. We estimate the critical exponents nu_W, nu_E and nu_x when either disorder W, energy E or concentration x is varied, respectively. All our results are compatible with the universal value nu ~ 1.6 obtained in the single-band Anderson model.
Plyushchay I. V.
Roemer Rudolf A.
Schreiber Michael
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