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

Chikina, A.; Generalov, A. LU ; Kummer, Kurt; Güttler, M.; Antonov, V. N.; Kucherenko, Yu; Kliemt, Kristin; Krellner, C.; Danzenbächer, S. and Kim, T., et al. (2017) In Physical Review B - Condensed Matter and Materials Physics 95(15).
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 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... (More)

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.

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published
subject
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Physical Review B - Condensed Matter and Materials Physics
volume
95
issue
15
publisher
American Physical Society
external identifiers
  • scopus:85017621242
  • wos:000399794900004
ISSN
1098-0121
DOI
10.1103/PhysRevB.95.155127
language
English
LU publication?
yes
id
836a1576-4304-476a-bbce-bc808769491b
date added to LUP
2017-05-08 11:40:56
date last changed
2017-09-18 11:35:18
@article{836a1576-4304-476a-bbce-bc808769491b,
  abstract     = {<p>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.</p>},
  articleno    = {155127},
  author       = {Chikina, A. and Generalov, A. and Kummer, Kurt and Güttler, M. and Antonov, V. N. and Kucherenko, Yu and Kliemt, Kristin and Krellner, C. and Danzenbächer, S. and Kim, T. and Dudin, P. and Geibel, C. and Laubschat, C and Vyalikh, D V},
  issn         = {1098-0121},
  language     = {eng},
  month        = {04},
  number       = {15},
  publisher    = {American Physical Society},
  series       = {Physical Review B - Condensed Matter and Materials Physics},
  title        = {Valence instability in the bulk and at the surface of the antiferromagnet SmRh2Si2},
  url          = {http://dx.doi.org/10.1103/PhysRevB.95.155127},
  volume       = {95},
  year         = {2017},
}