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Metal-insulator transitions: influence of lattice structure, jahn-teller effect, and Hund's rule coupling | | J E Han
; E Koch
; O Gunnarsson
; | | Date: |
7 Feb 2000 | | Journal: | Phys Rev Lett, 84 (6), 1276-9 | | Abstract: | We study the influence of the lattice structure, the Jahn-Teller effect, and the Hund’s rule coupling on a metal-insulator transition in A(n)C60 (A = K,Rb). The difference in the lattice structure favors A3C60 (fcc) being a metal and A4C60 (bct) being an insulator, and the coupling to H(g) Jahn-Teller phonons favors A4C60 being nonmagnetic. The coupling to H(g) ( A(g)) phonons decreases (increases) the value U(c) of the Coulomb integral at which the metal-insulator transition occurs. There is an important partial cancellation between the Jahn-Teller effect and the Hund’s rule coupling. | | Source: | PubMed, pmid11017497 | | Services: | Forum | Review | Favorites | |
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