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FT-STS
Quasiparticle Interference
Vortex Checkerboard
Nanoscale Inhomogeneity
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Coincidence of
checkerboard charge order and antinodal state decoherence
in strongly underdoped superconducting
Bi2Sr2CaCu2O8+x
K. McElroy,1,2,3 D.-H. Lee,1,2 J. E. Hoffman,4 K. M.
Lang,5 J. Lee,3 E. W. Hudson,6 H. Eisaki,7
S. Uchida,8 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
Phys. Rev. Lett.
Volume 94, 197005 (18 May 2005).
Abstract
The doping dependence of nanoscale electronic structure in superconducting
Bi2Sr2CaCu2O8+x 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 Q≅(±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.
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