Origin of the shadow Fermi surface in Bi-based cuprates
A. Koitzsch, S. V. Borisenko, A. A. Kordyuk, T. K. Kim, M. Knupfer, J., Fink, M. S. Golden, W. Koops, H. Berger, B. Keimer, C. T. Lin, S. Ono, Y., Ando, R. Follath
TL;DR
This study uses angle-resolved photoemission spectroscopy to determine that the shadow Fermi surface in Bi-based cuprates has a structural origin rather than arising from antiferromagnetic interactions.
Contribution
It provides direct experimental evidence that the shadow bands in Bi-based high-temperature superconductors are structurally induced, not magnetic.
Findings
Shadow band has same peakwidth and dispersion as main band
Shadow band/main band intensity ratio is binding energy independent
Shadow bands originate from structural effects, not magnetic interactions
Abstract
We used angle-resolved photoemission spectroscopy to study the shadow Fermi surface in one layer Bi2Sr1.6La0.4CuO6+delta and two layer (Bi,Pb)2Sr2CaCu2O8+delta. We find the shadow band to have the same peakwidth and dispersion as the main band. In addition, the shadow band/main band intensity ratio is found to be binding energy independent. Consequently, it is concluded that the shadow bands in Bi-based HTSC do not originate from antiferromagnetic interactions but have a structural origin.
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