VARIATIONAL STUDY OF SPIN-DENSITY WAVES AND CHARGE-DENSITY WAVES IN C-60 GEOMETRY

Recently various studies have been devoted to the spin-density-wave (S DW) stability on a C60 truncated icosahedron structure described by th e Hubbard Hamiltonian. We present a Gutzwiller approach to this proble m and also give a description of the charge-density wave (CDW) on the same geometry. The various Gutzwiller terms which are needed are deriv ed in a simple way. Our results on SDW are close to those of other cal culations both for the critical U/\beta\c approximately 3 value beyond which the SDW configuration is more stable (U, intra-atomic correlati on energy; beta, transfer energy) and for the value of the energy and the magnetic moment of the SDW state. In the U/\beta\ range studied th e excitation energy of the CDW state is almost constant.