Ultrahigh-Resolution Photoemission Spectroscopy of Ni Borocarbides: Direct Observation of the Superconducting Gap and a Change in Gap Anisotropy by Impurity

2000 ◽  
Vol 85 (23) ◽  
pp. 4952-4955 ◽  
Author(s):  
T. Yokoya ◽  
T. Kiss ◽  
T. Watanabe ◽  
S. Shin ◽  
M. Nohara ◽  
...  
Keyword(s):  
Direct Observation ◽  
Photoemission Spectroscopy ◽  
Superconducting Gap ◽  
Ultrahigh Resolution ◽  
Gap Anisotropy

Superconducting Gap of Fe-Intercalated TiSe2 Observed Using Ultrahigh-Resolution Photoemission Spectroscopy

2009 ◽  
Vol 152-153 ◽  
pp. 453-456
Author(s):  
T.V. Kuznetsova ◽  
Vladimir I. Grebennikov
Keyword(s):  
Density Of States ◽  
Photoemission Spectroscopy ◽  
Superconducting Gap ◽  
Superconducting Transition ◽  
Ultrahigh Resolution

Ultrahigh-resolution photoemission spectroscopy of 1T-Fe0.5TiSe2 was performed in order to study the changes in the density of states across the superconducting transition. We observed the gap about 2 meV in spectrum measured at 4.5 K.

scholarly journals Angle-resolved photoemission spectroscopy study of the superconducting gap anisotropy inBi2Sr2CaCu2O8+x

1996 ◽  
Vol 54 (14) ◽  
pp. R9678-R9681 ◽  
Author(s):  
H. Ding ◽  
M. R. Norman ◽  
J. C. Campuzano ◽  
M. Randeria ◽  
A. F. Bellman ◽  
...  
Keyword(s):  
Photoemission Spectroscopy ◽  
Superconducting Gap ◽  
Spectroscopy Study ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Gap Anisotropy

Direct observation of pseudogap of SmB6 using ultrahigh-resolution photoemission spectroscopy

2002 ◽  
Vol 312-313 ◽  
pp. 329-330 ◽  
Author(s):  
S. Souma ◽  
H. Kumigashira ◽  
T. Ito ◽  
T. Takahashi ◽  
S. Kunii
Keyword(s):  
Direct Observation ◽  
Photoemission Spectroscopy ◽  
Ultrahigh Resolution

scholarly journals Revealing the intrinsic superconducting gap anisotropy in surface-neutralized BaFe2(As0.7P0.3)2

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Ziming Xin ◽  
Yudi Wang ◽  
Cong Cai ◽  
Zhengguo Wang ◽  
Lei Chen ◽  
...  
Keyword(s):  
Alkaline Earth ◽  
Theoretical Models ◽  
Photoemission Spectroscopy ◽  
Superconducting Gap ◽  
Iron Based Superconductors ◽  
Future Studies ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Gap Anisotropy ◽  
Iron Based ◽  
Potassium Deposition

AbstractAlkaline-earth iron arsenide (122) is one of the most studied families of iron-based superconductors, especially for angle-resolved photoemission spectroscopy. While extensive photoemission results have been obtained, the surface complexity of 122 caused by its charge-non-neutral surface is rarely considered. Here, we show that the surface of 122 can be neutralized by potassium deposition. In potassium-coated BaFe2(As0.7P0.3)2, the surface-induced spectral broadening is strongly suppressed, and hence the coherent spectra that reflect the intrinsic bulk electronic state recover. This enables the measuring of superconducting gap with unpreceded precision. The result shows the existence of two pairing channels. While the gap anisotropy on the outer hole/electron pockets can be well fitted using an s± gap function, the gap anisotropy on the inner hole/electron shows a clear deviation. Our results provide quantitative constraints for refining theoretical models and also demonstrate an experimental method for revealing the intrinsic electronic properties of 122 in future studies.

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