Divalent EuRh₂Si₂ as a reference for the Luttinger theorem and antiferromagnetism in trivalent heavy-fermion YbRh₂Si₂.

ABSTRACT: Application of the Luttinger theorem to the Kondo lattice YbRh₂Si₂ suggests that its large 4f-derived Fermi surface (FS) in the paramagnetic (PM) regime should be similar in shape and volume to that of the divalent local-moment antiferromagnet (AFM) EuRh₂Si₂ in its PM regime. Here we show by angle-resolved photoemission spectroscopy that paramagnetic EuRh₂Si₂ has a large FS essentially similar to the one seen in YbRh₂Si₂ down to 1 K. In EuRh₂Si₂ the onset of AFM order below 24.5 K induces an extensive fragmentation of the FS due to Brillouin zone folding, intersection and resulting hybridization of the Fermi-surface sheets. Our results on EuRh₂Si₂ indicate tha

SUBMITTER: Guttler M 

PROVIDER: S-EPMC6377675 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature