Author:
Lee Seokbae,Seo Yu-Seong,Roh Seulki,Song Dongjoon,Eisaki Hiroshi,Hwang Jungseek
Abstract
AbstractWe investigated four single crystals of K-doped BaFe$$_2$$
2
As$$_2$$
2
(Ba-122), Ba$$_{1-x}$$
1
-
x
K$$_x$$
x
Fe$$_2$$
2
As$$_2$$
2
with $$x =$$
x
=
0.29, 0.36, 0.40, and 0.51, using infrared spectroscopy. We explored a wide variety of doping levels, from under- to overdoped. We obtained the superfluid plasma frequencies ($$\Omega _{\textrm{sp}}$$
Ω
sp
) and corresponding London penetration depths ($$\uplambda _{\textrm{L}}$$
λ
L
) from the measured optical conductivity spectra. We also extracted the electron-boson spectral density (EBSD) functions using a two-parallel charge transport channel approach in the superconducting (SC) state. From the extracted EBSD functions, the maximum SC transition temperatures ($$T_c^{\textrm{Max}}$$
T
c
Max
) were determined using a generalized McMillan formula and the SC coherence lengths ($$\xi _{\textrm{SC}}$$
ξ
SC
) were calculated using the timescales encoded in the EBSD functions and reported Fermi velocities. We identified some similarities and differences in the doping-dependent SC quantities between the K-doped Ba-122 and the hole-doped cuprates. We expect that the various SC quantities obtained across the wide doping range will provide helpful information for establishing the microscopic pairing mechanism in Fe-pnictide superconductors.
Funder
National Research Foundation of Korea
Publisher
Springer Science and Business Media LLC
Cited by
1 articles.
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