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Jahn–Teller effect and electron correlation in alkali doped fullerides
Author(s) -
Chibotaru L. F.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200460027
Subject(s) - superexchange , disproportionation , jahn–teller effect , electronic correlation , alkali metal , chemistry , hubbard model , condensed matter physics , spin (aerodynamics) , electron , mott transition , doping , physics , ion , ferromagnetism , quantum mechanics , superconductivity , catalysis , biochemistry , organic chemistry , thermodynamics
The interplay between Jahn–Teller effect and electron correlation in alkali doped fullerides is reviewed for compounds from both sides of Mott–Hubbard transition. In Mott–Hubbard fullerides the nature of low‐lying excitations strongly depends on the symmetry of the compounds, corresponding either to spin (Heisenberg) type for low symmetry compounds (K 3 (NH 3 )C 60 ) or to spin‐vibronic superexchange for cubic compounds (Li 3 (NH 3 ) 6 C 60 ). In the band fullerides (A 3 C 60 , A 4 C 60 , A = K, Rb) the Jahn–Teller effect leads to a splitting of the cubic band structure in three or two unequally populated subbands (orbital disproportionation), which gives rise to a number of features in the spectroscopy of these compounds. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)