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

Chikina, A., Generalov, A., Kummer, K., Guettler, M., Antonov, V. N., Kucherenko, Y., et al. (2017). Valence instability in the bulk and at the surface of the antiferromagnet SmRh2Si2. Physical Review B, 95(15): 155127, pp. 1-11. doi:10.1103/PhysRevB.95.155127.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-499A-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-D40B-9
Genre: Journal Article

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 Creators:
Chikina, A.1, Author
Generalov, A.1, Author
Kummer, K.1, Author
Guettler, M.1, Author
Antonov, V. N.1, Author
Kucherenko, Yu.1, Author
Kliemt, K.1, Author
Krellner, C.1, Author
Danzenbaecher, S.1, Author
Kim, T.1, Author
Dudin, P.1, Author
Geibel, C.2, Author              
Laubschat, C.1, Author
Vyalikh, D. V.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: 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 4 f emission strongly dominates, a small divalent 4 f 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 4 f 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.

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Language(s): eng - English
 Dates: 2017-04-172017-04-17
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 95 (15) Sequence Number: 155127 Start / End Page: 1 - 11 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008