Nonmagnetic molecular Jahn-Teller Mott insulators

Article

关键词: ELECTRON-VIBRON INTERACTIONS;    CHARGED FULLERENES;    BERRY-PHASE;    DOPED C-60;    KXC60;   

DOI  :  10.1103/PhysRevB.55.13465

来源: SCIE

【 摘 要 】

Narrow-band conductors may turn insulating and magnetic as a consequence of strong electron-electron correlation. In molecular conductors, the concomitance of a strong Jahn-Teller coupling may give rise to the alternative possibility of a nonmagnetic insulator, with or without a static cooperative Jahn-Teller distortion. In the latter case the insulator has Mott-like properties, with an interesting interplay between electron-electron repulsion and the Jahn-Teller effect, which is dynamical. We study this kind of nonmagnetic insulator in a very simple E circle times e Jahn-Teller model and we discuss its general properties in a more general context, also in connection with the insulating state of K4C60 and Rb4C60.

【 授权许可】

Free