Abstract
The energy band structure and the Fermi surface are calculated for LaRu 2 Si 2 with a body-centered tetragonal crystal structure by a self-consistent relativistic symmetrized APW method with the exchange and correlation potential in the local-density approximation. The main Fermi surface is an extraordinarily large, closed hole sheet with a cross-sectional area exceeding the size of the Brillouin zone itself. There are additionally small hole and electron sheets, all of which have no open orbit. The Fermi surface topology is consistent with the experimental result for the high-field transverse magnetoresistance. By these Fermi surfaces, both the magnitude and the angular dependence of the frequency branches of the de Haas-van Alphen effect measured recently by Ōnuki et al. can be explained reasonably well. The Fermi surfaces of the related heavy-electron compound CeRu 2 Si 2 and ferromagnetic compound CeRu 2 Ge 2 are discussed briefly.
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