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research
Temperature dependent Eu 3d-4f X-ray Absorption and Resonant Photoemission Study of the Valence Transition in
E
u
N
i
2
(
S
i
0.2
G
e
0.8
)
2
EuNi_2(Si_{0.2}Ge_{0.8})_2
E
u
N
i
2
​
(
S
i
0.2
​
G
e
0.8
​
)
2
​
Authors
A. Chainani
F. de Groot
+15Â more
H. Ohashi
H. Wada
J. W. Allen
K. Horiba
K. Mimura
K. Yamamoto
M. Matsunami
M. Shiga
M. Taguchi
N. Kamakura
R. Cowan
S. Shin
W. Drube
Y. Senba
Y. Takata
Publication date
22 July 2005
Publisher
'American Physical Society (APS)'
Doi
Cite
View
on
arXiv
Abstract
We study the mixed valence transition (
T
T
T
v
_{v}
v
​
∼
\sim
∼
80 K) in EuNi
2
_{2}
2
​
(Si
0.2
_{0.2}
0.2
​
Ge
0.8
_{0.8}
0.8
​
)
2
_{2}
2
​
using Eu 3
d
−
4
f
d-4f
d
−
4
f
X-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (RESPES). The Eu
2
+
^{2+}
2
+
and Eu
3
+
^{3+}
3
+
main peaks show a giant resonance and the spectral features match very well with atomic multiplet calculations. The spectra show dramatic temperature (
T
T
T
)-dependent changes over large energies (
∼
\sim
∼
10 eV) in RESPES and XAS. The observed non-integral mean valencies of
∼
\sim
∼
2.35
±
\pm
±
0.03 (
T
T
T
= 120 K) and
∼
\sim
∼
2.70
±
\pm
±
0.03 (
T
T
T
= 40 K) indicate homogeneous mixed valence above and below
T
T
T
v
_{v}
v
​
. The redistribution between Eu
2
+
^{2+}
2
+
4
f
7
4f^7
4
f
7
+
[
s
p
d
]
0
[spd]^0
[
s
p
d
]
0
and Eu
3
+
^{3+}
3
+
4
f
6
4f^6
4
f
6
+
[
s
p
d
]
1
[spd]^1
[
s
p
d
]
1
states is attributed to a hybridization change coupled to a Kondo-like volume collapse.Comment: 4 pages, 3 figure
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Last time updated on 02/01/2020