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20 April 2024
 
  » arxiv » cond-mat/9910319

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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 21 Oct 1999
Journal Phys. Rev. Lett. 84, 1276 (2000)
Subject Strongly Correlated Electrons | cond-mat.str-el
AffiliationMax-Planck-Institut fur Festkorperforschung, Stuttgart
AbstractWe study the influence of the lattice structure, the Jahn-Teller effect and the Hund’s rule coupling on a metal-insulator transition in AnC60 (A= K, Rb). The difference in lattice structure favors A3C60 (fcc) being a metal and A4C60 (bct) being an insulator, and the coupling to Hg Jahn-Teller phonons favors A4C60 being nonmagnetic. The coupling to Hg (Ag) phonons decreases (increases) the value Uc 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 arXiv, cond-mat/9910319
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