Superconductivity-Induced Self-Energy Evolution of the Nodal Electron of Optimally-Doped Bi2212

Details Superconductivity-Induced Self-Energy Evolution of the Nodal Electron of Optimally-Doped Bi2212 Superconductivity-Induced Self-Energy Evolution of the Nodal Electron of Optimally-Doped Bi2212

2008-04-06

arxiv.org/abs/0804.0888v1

Phys. Rev. B 77, 140504(R) (2008)

Physics

Condensed Matter

Superconductivity

4 page 3 figures,submitted ro PRB

Scientific paper

10.1103/PhysRevB.77.140504

The temperature dependent evolution of the renormalization effect in optimally-doped Bi2212 along the nodal direction has been studied via angle-resolved photoemission spectroscopy. Fine structure is observed in the real part of the self-energy (Re$\Sigma$), 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 Re$\Sigma$ 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.

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