We study the unconventional insulating state in A(4)C(60) by means of the dynamical mean-held theory. The interplay between the electron-electron correlation and the Jahn-Teller interaction determines the properties of these compounds. The system is a Mott-Jahn-Teller insulator. In that state, conduction between molecules is blocked by on-site Coulomb repulsion, magnetism is suppressed by intra-molecular Jahn-Teller effect, and important excitations (such as optical and spin gap) are found to be essentially intra-molecular. Experimental values of the optical and spin gaps are recovered by our calculations. RI Capone, Massimo/A-7762-2008
Interplay of strong correlation and Jahn-Teller effect in orbitally degenerate systems / Capone, Massimo. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - ISSN 0217-9792. - 14:29-31(2000), pp. 3380-3385. [10.1142/S021797920000385X]
Interplay of strong correlation and Jahn-Teller effect in orbitally degenerate systems
Capone, Massimo
2000-01-01
Abstract
We study the unconventional insulating state in A(4)C(60) by means of the dynamical mean-held theory. The interplay between the electron-electron correlation and the Jahn-Teller interaction determines the properties of these compounds. The system is a Mott-Jahn-Teller insulator. In that state, conduction between molecules is blocked by on-site Coulomb repulsion, magnetism is suppressed by intra-molecular Jahn-Teller effect, and important excitations (such as optical and spin gap) are found to be essentially intra-molecular. Experimental values of the optical and spin gaps are recovered by our calculations. RI Capone, Massimo/A-7762-2008I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
