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Phys. Rev. Lett. 96, 157003 (2006) [4 pages]

Doping Dependence of the Coupling of Electrons to Bosonic Modes in the Single-Layer High-Temperature Bi2Sr2CuO6 Superconductor

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W. Meevasana1,*, N. J. C. Ingle1,†, D. H. Lu1, J. R. Shi2, F. Baumberger1, K. M. Shen1,†, W. S. Lee1, T. Cuk1, H. Eisaki3, T. P. Devereaux4, N. Nagaosa5, J. Zaanen1,‡, and Z.-X. Shen1
1Department of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
2Institute of Physics and ICQS, Chinese Academy of Sciences, Beijing, People’s Republic of China
3Nanoelectronic Research Institute, AIST, Tsukuba 305-0032, Japan
4Department of Physics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
5CREST, Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

Received 1 September 2005; published 19 April 2006

A recent highlight in the study of high-Tc superconductors is the observation of band renormalization or 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, nonsuperconducting single-layer Bi-cuprate (Bi2Sr2CuO6). In addition to the appearance of a strong overall weakening, we also find that the 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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.157003
DOI:
10.1103/PhysRevLett.96.157003
PACS:
74.72.Hs, 71.38.−k, 79.60.−i

*Electronic address: non@stanford.edu

†Present address: Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada.

‡On leave from the Instituut-Lorentz for Theoretical Physics, Leiden University, Leiden, The Netherlands.

 
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