The two-band model and the metal-nonmetal transition in magnetlc systems
DOI:
https://doi.org/10.5902/2179460X26354Abstract
Using the two band model introduced by Mota and Coutinho-Filho, the metal-nonmetal transition is investigated by taking an approximate model Hamiltonian which takes into accout the hybridization of the bands, not included in the original model. A Green's function technique is used to obtain the hybrid bands inthe Hartree-Fock approximation. Investigating the phenomenon of metal-nonmetal transition, in general, increasing the intra-atomic interaction the tendency of the systems toward nonmetalic behavior increases. But, differently of previous results, for strong hybridization and small intra-atomic interaction, where the Hartree-fock approximation is valid, the opposite is observed. this may help to understand the difficult os observing pressure-induced nonmetal-metal transitions in magnetic systems.Downloads
References
G. Bednorz and K. A. Muller. Z. Phys. B64. 189 (1986); P. M. Lambert, P. P. Edwards and M. R. Harrisson. J. of. Sol. State Chem. 89, 345 (1990).
R. J. Jellito. Phys. Status Solidi B 147, 391 (1988).
H. J. Schulz. Europhys, Lett. 4. 609 (1987); Phys. Rev. Lett. 64, 1445 (1990).
J. Zaanen and O. Gunnersson. Phys. Rev. 40, 7391 (1989).
M. Innui and P. B. Littlewood. Phys. Rev. B. 44, 4415 (1991).
N. F. Mott, Phil. Mag. 6, 287 (1961); Proc. Phys. Soc. (London) A 62, 416 (1949).
D. Adler, Rev. Mod. Phys. 40, 714 (1968); Solid State Phys. 21, 1, (1968).
R. Mota, Can. J. of Physics 63, 1576 (1985).
J. Hubbard, Proc. Roy. Soc. (London) A276, 238-57 (1963); J. Kanamori, Progr. Theoret. Phys. (Kyoto) 30, 275 (1963); M. C. Gutzwiller, Phys. Rev. 137, A 7726, 238 (1965).
R. Kishore and S. K. Joshi, Phys. Rev. B2, 1411 (1970).
R. Mota and M. D. Coutinho Filho, Phys. Rev. B33, 7724 (1985).
D. N. Zubarev, Usp. Fiz. Nauk 71,71 (1960) [Soviet Phys. Usp. 3, 320 (1960)]
R. Kishore and S. K. Joshi, Phys. Stat Sol. 42, k131 (1970).
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