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research
The unusual thickness dependence of superconductivity in
α
\alpha
α
-MoGe thin films
Authors
D. B. Tanner
E. J. Nicol
+5Â more
F. Marsiglio
G. L. Carr
H. Tashiro
J. M. Graybeal
J. P. Carbotte
Publication date
7 March 2008
Publisher
'American Physical Society (APS)'
Doi
Cite
View
on
arXiv
Abstract
Thin films of
α
\alpha
α
-MoGe show progressively reduced
T
c
T_{c}
T
c
​
's as the thickness is decreased below 30 nm and the sheet resistance exceeds 100
Ω
/
â–¡
\Omega/\Box
Ω/
â–¡
. We have performed far-infrared transmission and reflection measurements for a set of
α
\alpha
α
-MoGe films to characterize this weakened superconducting state. Our results show the presence of an energy gap with ratio
2
Δ
0
/
k
B
T
c
=
3.8
±
0.1
2\Delta_0/k_BT_{c} = 3.8 \pm 0.1
2
Δ
0
​
/
k
B
​
T
c
​
=
3.8
±
0.1
in all films studied, slightly higher than the BCS value, even though the transition temperatures decrease significantly as film thickness is reduced. The material properties follow BCS-Eliashberg theory with a large residual scattering rate except that the coherence peak seen in the optical scattering rate is found to be strongly smeared out in the thinner superconducting samples. A peak in the optical mass renormalization at
2
Δ
0
2\Delta_0
2
Δ
0
​
is predicted and observed for the first time
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Last time updated on 02/01/2020