Abstract

Relativistic energy band calculations have been carried out for CeIrIn5, CeCoIn5, UFeGa5, UCoGa5 andURhGa5under the assumption that f electrons are itinerant. The main Fermi surface sheet of CeIrIn5 is quite similar tothat of CeCoIn5,which is a quasi-two-dimensional Fermi surface. The Fermi surface sheets of UCoGa5are quite similar to those of URhGa5,which are all small in size and closed in topology. UFeGa5has a quasi-two-dimensional Fermi surface and a lattice-structure-like Fermisurface.

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