The Jahn-Teller effect has been studied for
the photoemission from negatively
charged C60 molecules
(Phys. Rev. Lett. 47, 1875 (1995)).
It was found that the Jahn-Teller effect strongly influences the
estimates of the electron-phonon interaction.
The influence of the Jahn-Teller effect on the effective Coulomb
interaction has been studied
( Phys. Rev. B 51, 3493 (1995)).
It was found that
for this property the system behaves essentially as being in
the strong coupling limit.
The g-factor has been investigated
( Phys. Rev. B 54, 17184 (1995)).
The orbital moment has a large contribution from the l=5 character
of the orbital,
but is reduced by the Jahn-Teller effect due to a Ham factor.
The effective spin-orbit coupling, which couples the orbital and spin
moments, is drastically reduced by the small C60
curvature. An effective g-factor substantially smaller than 2 is
expected for the free molecule.
The (dynamical) Jahn-Teller effect is found to play an essential role for
the metal-insulator transition in
AnC60. In particular,
the Jahn-Teller effect is responsible for the
A4C60 being nonmmagnetic.
Max-Planck Institut für Festkörperforschung
Postfach 800 665
D-70506 Stuttgart
Andersen Group
|
Max-Planck-Institut für Festkörperforschung
Heisenbergstraße 1 D-70569 Stuttgart
|