AB-INITIO CALCULATION OF THE FERMI-SURFACE OF RUO2

The Fermi surface (FS) of RuO2 in the rutile structure is calculated o n the base of the self-consistent energy band structure in the local d ensity approximation (LDA). The results of two bandstructure methods a re compared, the extended linear augmented plane wave method (ELAPW) i n the muffin-tin approximation and the linear-muffin-tin-orbital metho d (LMTO) with combined correction (CC). The angular dependence of the extremal cross-sections of the Fermi surface is in a good agreement wi th magnetothermal oscillations measurements.