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Insight into the temperature dependent properties of the ferromagnetic Kondo lattice YbNiSn

Generalov, A. LU ; Sokolov, D. A. ; Chikina, A. ; Kucherenko, Yu ; Antonov, V. N. ; Bekenov, L. V. ; Patil, S. ; Huxley, A. D. ; Allen, J. W. and Matho, K. , et al. (2017) In Physical Review B 95(18).
Abstract

Analyzing temperature dependent photoemission (PE) data of the ferromagnetic Kondo-lattice (KL) system YbNiSn in the light of the periodic Anderson model (PAM) we show that the KL behavior is not limited to temperatures below a temperature TK, defined empirically from resistivity and specific heat measurements. As characteristic for weakly hybridized Ce and Yb systems, the PE spectra reveal a 4f-derived Fermi level peak, which reflects contributions from the Kondo resonance and its crystal electric field (CEF) satellites. In YbNiSn this peak has an unusual temperature dependence: With decreasing temperature a steady linear increase of intensity is observed which extends over a large interval ranging from 100 K down to 1 K without... (More)

Analyzing temperature dependent photoemission (PE) data of the ferromagnetic Kondo-lattice (KL) system YbNiSn in the light of the periodic Anderson model (PAM) we show that the KL behavior is not limited to temperatures below a temperature TK, defined empirically from resistivity and specific heat measurements. As characteristic for weakly hybridized Ce and Yb systems, the PE spectra reveal a 4f-derived Fermi level peak, which reflects contributions from the Kondo resonance and its crystal electric field (CEF) satellites. In YbNiSn this peak has an unusual temperature dependence: With decreasing temperature a steady linear increase of intensity is observed which extends over a large interval ranging from 100 K down to 1 K without showing any peculiarities in the region of TK∼TC=5.6 K. In the light of the single-impurity Anderson model (SIAM) this intensity variation reflects a linear increase of 4f occupancy with decreasing temperature, indicating an onset of Kondo screening at temperatures above 100 K. Within the PAM this phenomenon could be described by a non-Fermi-liquid-like T- linear damping of the self-energy which accounts phenomenologically for the feedback from the closely spaced CEF states.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
95
issue
18
article number
184433
publisher
American Physical Society
external identifiers
  • scopus:85024367261
ISSN
2469-9950
DOI
10.1103/PhysRevB.95.184433
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2017 American Physical Society.
id
5ea349d5-f8cc-4f46-9712-324906fca83e
date added to LUP
2022-03-31 14:31:43
date last changed
2022-04-23 23:15:09
@article{5ea349d5-f8cc-4f46-9712-324906fca83e,
  abstract     = {{<p>Analyzing temperature dependent photoemission (PE) data of the ferromagnetic Kondo-lattice (KL) system YbNiSn in the light of the periodic Anderson model (PAM) we show that the KL behavior is not limited to temperatures below a temperature TK, defined empirically from resistivity and specific heat measurements. As characteristic for weakly hybridized Ce and Yb systems, the PE spectra reveal a 4f-derived Fermi level peak, which reflects contributions from the Kondo resonance and its crystal electric field (CEF) satellites. In YbNiSn this peak has an unusual temperature dependence: With decreasing temperature a steady linear increase of intensity is observed which extends over a large interval ranging from 100 K down to 1 K without showing any peculiarities in the region of TK∼TC=5.6 K. In the light of the single-impurity Anderson model (SIAM) this intensity variation reflects a linear increase of 4f occupancy with decreasing temperature, indicating an onset of Kondo screening at temperatures above 100 K. Within the PAM this phenomenon could be described by a non-Fermi-liquid-like T- linear damping of the self-energy which accounts phenomenologically for the feedback from the closely spaced CEF states.</p>}},
  author       = {{Generalov, A. and Sokolov, D. A. and Chikina, A. and Kucherenko, Yu and Antonov, V. N. and Bekenov, L. V. and Patil, S. and Huxley, A. D. and Allen, J. W. and Matho, K. and Kummer, K. and Vyalikh, D. V. and Laubschat, C.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{18}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Insight into the temperature dependent properties of the ferromagnetic Kondo lattice YbNiSn}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.95.184433}},
  doi          = {{10.1103/PhysRevB.95.184433}},
  volume       = {{95}},
  year         = {{2017}},
}