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 (SDW) stability on a C60 truncated icosahedron structure described by the Hubbard Hamiltonian. We present a Gutzwiller approach to this problem and also give a description of the charge-density wave (CDW) on the same geometry. The various Gutzwiller terms which are needed are derived in a simple way. Our results on SDW are close to those of other calculations both for the critical U/\beta\c approximately 3 value beyond which the SDW configuration is more stable (U, intra-atomic correlation 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 the excitation energy of the CDW state is almost constant.