Metal-insulator transitions: Influence of lattice structure, Jahn-Teller effect, and Hund's rule coupling

Preprint

21 October 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9910319

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 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.

Keywords

METAL INSULATOR TRANSITION
LATTICE STRUCTURE
TELLER EFFECT
JAHN TELLER
HUND'S RULE
PHONONS

All Related Versions

Version 1, 1999-10-21, ArXiv
Published version: Physical Review Letters, 84 (6), 1276.

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