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We have investigated the electronic structure of the equiatomic EuAuMg,GdAuMg, YbAuMg and GdAgMg intermetallics using x-ray photoelectronspectroscopy. The spectra revealed that the Yb and Eu are divalent while the Gdis trivalent. The spectral weight in the vicinity of the Fermi level isdominated by the mix of Mg $s$, Au/Ag $sp$ and $RE$ $spd$ bands, and not by the$RE$ $4f$. We also found that the Au and Ag $d$ bands are extraordinarilynarrow, as if the noble metal atoms were impurities submerged in a low density$sp$ metal host. The experimental results were compared with band structurecalculations, and we found good agreement provided that the spin-orbitinteraction in the Au an Ag $d$ bands is included and correlation effects in anopen $4f$ shell are accounted for using the local density approximation +Hubbard $U$ scheme. Nevertheless, limitations of such a mean-field scheme toexplain excitation spectra are also evident.Comment: 4 pages, 3 figures, Brief Repor

physical review. b, condensed matter and materials physics

Electronic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mi>AuMg</mml:mi></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mi>AgMg</mml:mi></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi>Eu</mml:mi><mml:mo>,</mml:mo><mml:…

Electronic structure ofRAuMgandRAgMg(R=Eu,