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Direct observation of self-energy signatures of the resonant collective mode in Bi2Sr2CaCu2 O8+δ

Journal Article · · Physical Review B
 [1];  [1];  [2]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Here, we use high-resolution angle-resolved photoemission spectroscopy to study the resonant, collective excitation mode in the superconducting state of Bi2212. By collecting very high-quality data we found noteworthy features in the self-energy in the antinodal region, where the interaction of electrons with the mode is the strongest. This interaction leads to a pronounced peak in the scattering rate and we demonstrate that this feature is directly responsible for the well-known peak-dip-hump structure in cuprates. By studying how the weight of this peak changes with temperature we unequivocally demonstrate that interaction of electrons with the resonant mode in cuprates vanishes at Tc and is very much localized in the momentum space close to the antinode. These findings present a consistent picture of line shape and self-energy signatures of the electron-boson coupling in cuprates and resolve long-standing controversy surrounding this issue. The momentum dependence of the strength of electron-mode interaction enables development of quantitative theory of this phenomenon in cuprates.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-07CH11358; SC0012704
OSTI ID:
1357784
Alternate ID(s):
OSTI ID: 1412706
OSTI ID: 1354754
Report Number(s):
BNL--114499-2017-JA; IS-J--9330
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 17 Vol. 95; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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