Non magnetic molecular Jahn-Teller Mott insulators

Details Non magnetic molecular Jahn-Teller Mott insulators Non magnetic molecular Jahn-Teller Mott insulators

1997-02-10

arxiv.org/abs/cond-mat/9702079v1

Physics

Condensed Matter

Strongly Correlated Electrons

21 pages, Revtex, one included figure with epsfig.sty

Scientific paper

10.1103/PhysRevB.55.13465

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 non-magnetic 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 non-magnetic insulator in a very simple $E\otimes e$ Jahn-Teller model and we discuss its general properties in a more general context, also in connection with the insulating state of K_{4}C_{60} and Rb_{4}C_{60}.

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