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The electronic structure of ErGa3 and its isostructural compounds withTm, Yb, and Lu are investigated with a highly accurate band structure scheme in LDA and GGA and warped muffin-tin approximation. In contrast to other investigations, the 4f electrons of the constituent Re are also treated as part of the valence bands. The position of the corresponding 4f bands relative to the Fermi energy   strongly depends on the nuclear charge of Re. In Lu, they lie almost by 0.5 Ryd below  and are extremely narrow. In Er, both in LDA and GGA, the 4f bands are found to be veryclose to the Fermi level . Assuming most of the 4f electrons to be partof the core removes the disagreement almost completely but produces a Fermi surface with a topology markedly different from that proposed inprevious investigations. The intersections of the Fermi surface with planes are strongly varying within the Brillouin zone, they do not well match withthe sparse experimental results. Investigations using the LDA+U schemeas well as investigations of the dielectric response function are sketched

Electronic Structure of the Cubic Compounds ReGa3(Re = Er, Tm, Yb, and Lu)

Electronic Structure of the Cubic Compounds ReGa₃(Re = Er, Tm, Yb, and Lu)