On the mean-field theory of the metal-insulator phase transition

✍ Scribed by J.G. Brankov; N.Ch. Pesheva

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 765 KB
• Volume: 129
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/0378-4371(85)90178-5

✦ Synopsis

Two mean-field models describing the metal-insulator phase transition are studied. In the model due to Keldysh and Kopaev (1964) different effective masses in the valence and conduction bands are considered and in the model due to Mattis and Langer (1970) the exact S.C. and b.c.c. densities of states are taken into account. It is shown that these modifications do not change the qualitative features of the phase diagrams. In each case a special attention is paid to the domain of the degenerate semiconductor, which has been of primary interest in many attempts to explain conjectured enhancement of superconductivity in systems undergoing dielectric transition. * In the sense that we use the analytical approximations suggested in ref. 8 which reproduce with high accuracy (better than 0.1%) the numerical evaluations of the exact S.C. and b.c.c. densities of states.