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research
In-plane optical spectral weight transfer in optimally doped Bi
2
_{2}
2
​
Sr
2
_{2}
2
​
Ca
2
_{2}
2
​
Cu
3
_{3}
3
​
O
10
_{10}
10
​
Authors
A. B. Kuzmenko
A. Junod
+8Â more
D. van der Marel
D. van der Marel
E. Giannini
E. van Heumen
F. Carbone
H. J. A. Molegraaf
M. Kugler
N. Petit
Publication date
1 January 2006
Publisher
'American Physical Society (APS)'
Doi
Cite
View
on
arXiv
Abstract
We examine the redistribution of the in-plane optical spectral weight in the normal and superconducting state in tri-layer \bbb (Bi2223) near optimal doping (
T
c
T_c
T
c
​
= 110 K) on a single crystal via infrared reflectivity and spectroscopic ellipsometry. We report the temperature dependence of the low-frequency integrated spectral weight
W
(
Ω
c
)
W(\Omega_c)
W
(
Ω
c
​
)
for different values of the cutoff energy
Ω
c
\Omega_c
Ω
c
​
. Two different model-independent analyses consistently show that for
Ω
c
\Omega_c
Ω
c
​
= 1 eV, which is below the charge transfer gap,
W
(
Ω
c
)
W(\Omega_c)
W
(
Ω
c
​
)
increases below
T
c
T_c
T
c
​
, implying the lowering of the kinetic energy of the holes. This is opposite to the BCS scenario, but it follows the same trend observed in the bi-layer compound \bb (Bi2212). The size of this effect is larger in Bi2223 than in Bi2212, approximately scaling with the critical temperature. In the normal state, the temperature dependence of
W
(
Ω
c
)
W(\Omega_c)
W
(
Ω
c
​
)
is close to
T
2
T^2
T
2
up to 300 K
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oai:unige.ch:aou:unige:24084
Last time updated on 07/06/2024
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Last time updated on 03/12/2019