Research output: Contribution to journal › Article › peer-review
Insight into the temperature dependent properties of the ferromagnetic Kondo lattice YbNiSn. / Generalov, A.; Sokolov, D. A.; Chikina, A.; Kucherenko, Yu.; Antonov, V. N.; Bekenov, L. V.; Patil, S.; Huxley, A. D.; Allen, J. W.; Matho, K.; Kummer, K.; Vyalikh, D. V.; Laubschat, C.
In: Physical Review B, Vol. 95, No. 18, 184433, 30.05.2017.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Insight into the temperature dependent properties of the ferromagnetic Kondo lattice YbNiSn
AU - Generalov, A.
AU - Sokolov, D. A.
AU - Chikina, A.
AU - Kucherenko, Yu.
AU - Antonov, V. N.
AU - Bekenov, L. V.
AU - Patil, S.
AU - Huxley, A. D.
AU - Allen, J. W.
AU - Matho, K.
AU - Kummer, K.
AU - Vyalikh, D. V.
AU - Laubschat, C.
PY - 2017/5/30
Y1 - 2017/5/30
N2 - Analyzing temperature dependent photoemission (PM) 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 (T) over bar (K), 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 (T) over bar (K) similar to T-C = 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.
AB - Analyzing temperature dependent photoemission (PM) 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 (T) over bar (K), 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 (T) over bar (K) similar to T-C = 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.
KW - PERIODIC ANDERSON MODEL
KW - IMPURITY MODEL
KW - PHOTOEMISSION
KW - RESONANCE
KW - CERIUM
KW - FIELD
KW - SPECTRA
KW - SYSTEMS
KW - METALS
KW - YBAL3
U2 - 10.1103/PhysRevB.95.184433
DO - 10.1103/PhysRevB.95.184433
M3 - статья
VL - 95
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 18
M1 - 184433
ER -
ID: 9322989