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Anomalous Superconducting-Gap Structure of Slightly Overdoped Ba(Fe1-xCox)(2)As-2

Title
Anomalous Superconducting-Gap Structure of Slightly Overdoped Ba(Fe1-xCox)(2)As-2
Authors
Hajiri, T[Hajiri, Tetsuya]Ito, T[Ito, Takahiro]Matsunami, M[Matsunami, Masaharu]Min, BH[Min, Byeong Hun]Kwon, YS[Kwon, Yong Seung]Kimura, S[Kimura, Shin-ichi]
DGIST Authors
Min, BH[Min, Byeong Hun]; Kwon, YS[Kwon, Yong Seung]
Issue Date
2014-09
Citation
Journal of the Physical Society of Japan, 83(9)
Type
Article
Article Type
Article
ISSN
0031-9015
Abstract
We observed the anisotropic superconducting-gap (SC-gap) structure of a slightly overdoped superconductor, Ba(Fe1-xCox)2As2 (x = 0.1), using three-dimensional (3D) angle-resolved photoemission spectroscopy. Two hole Fermi surfaces (FSs) observed at the Brillouin zone center and an inner electron FS at the zone corner showed a nearly isotropic SC gap in 3D momentum space. However, the outer electron FS showed an anisotropic SC gap with nodes or gap minima around the M and A points. The different anisotropies obtained the SC gap between the outer and inner electron FSs cannot be expected from all theoretical predictions with spin fluctuation, orbital fluctuation, and both competition. Our results provide a new insight into the SC mechanisms of iron pnictide superconductors. © 2014 The Physical Society of Japan.
URI
http://hdl.handle.net/20.500.11750/2644
DOI
10.7566/JPSJ.83.093703
Publisher
Physical Society of Japan
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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