Direct observation of the superconducting energy gap in the optical conductivity of the iron pnictide superconductorBa ( Fe 0.9 Co 0.1 ) 2 As 2
B.P. Gorshunov
1, 2
,
Di Wu
1
,
A. A. Voronkov
2
,
P. Kallina
1
,
Kazumasa Iida
3
,
S. Haindl
3
,
F Kurth
3
,
L. Schultz
3
,
B. Holzapfel
3
,
Publication type: Journal Article
Publication date: 2010-02-25
scimago Q1
wos Q2
SJR: 1.303
CiteScore: 6.2
Impact factor: 3.7
ISSN: 24699950, 24699969, 10980121, 1550235X
Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Abstract
The temperature-dependent optical reflectivity and complex transmissivity of an epitaxially grown Ba(Fe$_{0.9}$Co$_{0.1}$)$_2$As$_2$ thin film were measured and the optical conductivity and permittivity evaluated over a wide frequency range. The opening of the superconducting gap $2\Delta_0 = 3.7$ meV below $T_c\approx 20$ K is {\em directly} observed by a completely vanishing optical conductivity. The temperature and frequency dependent electrodynamic properties of Ba(Fe$_{0.9}$Co$_{0.1}$)$_2$As$_2$ in the superconducting state agree well with the BCS predictions with no nodes in the order parameter. The spectral weight of the condensate $1.94\times 10^7 {\rm cm}^{-2}$ corresponds to a London penetration depth $\lambda_L=3600$ \AA.
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Gorshunov B. et al. Direct observation of the superconducting energy gap in the optical conductivity of the iron pnictide superconductorBa(Fe0.9Co0.1)2As2 // Physical Review B. 2010. Vol. 81. No. 6. 060509
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Gorshunov B., Wu D., Voronkov A. A., Kallina P., Iida K., Haindl S., Kurth F., Schultz L., Holzapfel B., Dressel M. Direct observation of the superconducting energy gap in the optical conductivity of the iron pnictide superconductorBa(Fe0.9Co0.1)2As2 // Physical Review B. 2010. Vol. 81. No. 6. 060509
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TY - JOUR
DO - 10.1103/PhysRevB.81.060509
UR - https://doi.org/10.1103/PhysRevB.81.060509
TI - Direct observation of the superconducting energy gap in the optical conductivity of the iron pnictide superconductorBa(Fe0.9Co0.1)2As2
T2 - Physical Review B
AU - Gorshunov, B.P.
AU - Wu, Di
AU - Voronkov, A. A.
AU - Kallina, P.
AU - Iida, Kazumasa
AU - Haindl, S.
AU - Kurth, F
AU - Schultz, L.
AU - Holzapfel, B.
AU - Dressel, Martin
PY - 2010
DA - 2010/02/25
PB - American Physical Society (APS)
IS - 6
VL - 81
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
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@article{2010_Gorshunov,
author = {B.P. Gorshunov and Di Wu and A. A. Voronkov and P. Kallina and Kazumasa Iida and S. Haindl and F Kurth and L. Schultz and B. Holzapfel and Martin Dressel},
title = {Direct observation of the superconducting energy gap in the optical conductivity of the iron pnictide superconductorBa(Fe0.9Co0.1)2As2},
journal = {Physical Review B},
year = {2010},
volume = {81},
publisher = {American Physical Society (APS)},
month = {feb},
url = {https://doi.org/10.1103/PhysRevB.81.060509},
number = {6},
pages = {060509},
doi = {10.1103/PhysRevB.81.060509}
}
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