Physics – Condensed Matter – Superconductivity
Scientific paper
2006-02-22
Phys. Rev. Lett. 96, 157003 (2006)
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.96.157003
A recent highlight in the study of high-Tc superconductors is the observation of band renormalization / self-energy effects on the quasiparticles. This is seen in the form of kinks in the quasiparticle dispersions as measured by photoemission and interpreted as signatures of collective bosonic modes coupling to the electrons. Here we compare for the first time the self-energies in an optimally doped and strongly overdoped, non-superconducting single-layer Bi-cuprate (Bi2Sr2CuO6). Besides the appearance of a strong overall weakening, we also find that weight of the self-energy in the overdoped system shifts to higher energies. We present evidence that this is related to a change in the coupling to c-axis phonons due to the rapid change of the c-axis screening in this doping range.
Baumberger F.
Cuk T.
Devereaux Thomas P.
Eisaki Hiroshi
Ingle N. J. C.
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