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Phys. Rev. Lett. 94, 197005 (2005) [4 pages]

Coincidence of Checkerboard Charge Order and Antinodal State Decoherence in Strongly Underdoped Superconducting Bi2Sr2CaCu2O8+δ

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K. McElroy1,2,3, D.-H. Lee1,2, J. E. Hoffman4, K. M. Lang5, J. Lee3, E. W. Hudson6, H. Eisaki7, S. Uchida8, and J. C. Davis3,*
1Physics Department, University of California, Berkeley, California 94720, USA
2Material Sciences Division, Lawrence Berkeley National Lab., Berkeley, California 94720, USA
3LASSP, Department of Physics, Cornell University, Ithaca, New York 14850, USA
4Department of Applied Physics, Stanford University, Stanford, California 94305, USA
5Department of Physics, Colorado College, Colorado 80305, USA
6Department of Physics,MIT, Cambridge Massachusetts 02139, USA
7AIST, 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki, 305-8568 Japan
8Department of Physics, University of Tokyo, Tokyo, 113-8656 Japan

Received 4 June 2004; published 18 May 2005

The doping dependence of nanoscale electronic structure in superconducting Bi2Sr2CaCu2O8+δ is studied by scanning tunneling microscopy. At all dopings, the low energy density-of-states modulations are analyzed according to a simple model of quasiparticle interference and found to be consistent with Fermi-arc superconductivity. The superconducting coherence peaks, ubiquitous in near-optimal tunneling spectra, are destroyed with strong underdoping and a new spectral type appears. Exclusively in regions exhibiting this new spectrum, we find local “checkerboard” charge ordering of high energy states, with a wave vector of Q⃗=(±2π/4.5a0,0); (0,±2π/4.5a0)±15%. Surprisingly, this spatial ordering of high energy states coexists harmoniously with the low energy Bogoliubov quasiparticle states.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.197005
DOI:
10.1103/PhysRevLett.94.197005
PACS:
74.25.Dw, 71.18.+y, 74.50.+r, 74.72.Hs

*Electronic address: jcdavis@ccmr.cornell.edu

 
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