Superconductivity-induced self-energy evolution of the nodal electron of optimally doped Bi2Sr2Ca0.92Y0.08Cu2O8+δ
Abstract
The temperature dependent evolution of the renormalization effect in optimally doped Bi2Sr2Ca0.92Y0.08Cu2O8+δ along the nodal direction has been studied via angle-resolved photoemission spectroscopy. Fine structure is observed in the real part of the self-energy (ReΣ) , including a subkink and maximum, suggesting that electrons couple to a spectrum of bosonic modes, instead of just one mode. Upon cooling through the superconducting phase transition, the fine structures of the extracted ReΣ exhibit a two-processes evolution demonstrating an interplay between kink renormalization and superconductivity. We show that this two-process evolution can be qualitatively explained by a simple Holstein model in which a spectrum of bosonic modes is considered.
- Publication:
-
Physical Review B
- Pub Date:
- April 2008
- DOI:
- 10.1103/PhysRevB.77.140504
- arXiv:
- arXiv:0804.0888
- Bibcode:
- 2008PhRvB..77n0504L
- Keywords:
-
- 74.72.-h;
- 71.38.-k;
- 74.25.Kc;
- 79.60.-i;
- Cuprate superconductors;
- Polarons and electron-phonon interactions;
- Phonons;
- Photoemission and photoelectron spectra;
- Condensed Matter - Superconductivity
- E-Print:
- 4 page 3 figures,submitted ro PRB