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Reconstruction of the Bi2Sr2CaCu2 O8+δ Fermi surface

Journal Article · · Physical Review B
 [1];  [2];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics, Materials Science Dept.
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics, Materials Science Dept. ; Princeton Univ., NJ (United States)
The effects of structural supermodulation with the period $λ ≈ 26$ Å along the $$b$$ axis of Bi2Sr2CaCu2 O8+δ have been observed in photoemission studies from the early days as the presence of “diffraction replicas” of the intrinsic electronic structure. Although predicted to affect the electronic structure of the Cu-O plane, the influence of supermodulation potential on Cu-O electrons has never been observed in photoemission. In the present study, we clearly see the effects on the Bi2Sr2CaCu2 O8+δ electronic structure; we observe a hybridization of the intrinsic bands with the supermodulation replica bands in the form of avoided crossings and a corresponding reconstruction of the Fermi surface. We estimate the hybridization gap, $$2Δ_h ~ 25$$ meV, in the slightly underdoped samples. The hybridization weakens with doping and the anticrossing can no longer be resolved in strongly overdoped samples. In contrast, the “shadow” replica, shifted by ($π , π$) , is found not to hybridize with the original bands within our detection limits.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1595691
Report Number(s):
BNL--213577-2020-JAAM
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 24 Vol. 100; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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