Valence instability in the bulk and at the surface of the antiferromagnet SmRh2Si2

Using resonant angle-resolved photoemission spectroscopy and electron band-structure calculations, we explore the electronic structure and properties of Sm atoms at the surface and in the bulk of the antiferromagnet SmRh2Si2. We show that the Sm atoms reveal weak mixed-valent behavior both in the bulk and at the surface. Although trivalent 4f emission strongly dominates, a small divalent 4f signal near the Fermi energy can be clearly resolved for surface and bulk Sm atoms. This behavior is quite different to most other Sm-based materials which typically experience a surface valence transition to a divalent state of Sm atoms at the surface. This phenomenon is explained in analogy to the isostructural Ce compound, where strong 4f hybridization stabilizes mixed-valent ground state both in the bulk and at the surface, and which were described in the light of the single-impurity Anderson model. Implications for other RERh2Si2 (RE = rare-earth elements) compounds are discussed.

Generalov, A.Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)maxl-arg (författare)
Kummer, KurtEuropean Synchrotron Radiation Facility (författare)
Güttler, M.Dresden University of Technology (författare)
Antonov, V. N.G.V. Kurdyumov Institute for Metal Physics of National Academy of Sciences of Ukraine (författare)
Kucherenko, YuG.V. Kurdyumov Institute for Metal Physics of National Academy of Sciences of Ukraine (författare)
Kliemt, KristinGoethe University (författare)
Krellner, C.Goethe University (författare)
Danzenbächer, S.Dresden University of Technology (författare)
Kim, T.Diamond Light Source (författare)
Dudin, P.Diamond Light Source (författare)
Geibel, C.Max Planck Institute for Chemical Physics of Solids (författare)
Laubschat, CDresden University of Technology (författare)
Vyalikh, D VSaint Petersburg State University,Basque Foundation for Science,University of the Basque Country (författare)
Dresden University of TechnologyMAX IV-laboratoriet (creator_code:org_t)

Ingår i:Physical Review B - Condensed Matter and Materials Physics95:151098-0121

Av författaren/redakt...: Chikina, A.; Generalov, A.; Kummer, Kurt; Güttler, M.; Antonov, V. N.; Kucherenko, Yu; visa fler...; Kliemt, Kristin; Krellner, C.; Danzenbächer, S.; Kim, T.; Dudin, P.; Geibel, C.; Laubschat, C; Vyalikh, D V; visa färre...

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