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Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+
J. E. Hoffman,1K. McElroy,1D.-H. Lee,16K. M Lang,12H. Eisaki,345S. Uchida,5J. C. Davis16*
Scanning tunneling spectroscopy of the
high-Tc superconductor
Bi2Sr2CaCu2O8+
reveals weak, incommensurate, spatialmodulations in the tunneling
conductance. Images of these energy-dependentmodulations are Fourier
analyzed to yield the dispersion of theirwavevectors. Comparison of
the dispersions with photoemissionspectroscopy data indicates
that quasiparticle interference, dueto elastic scattering between
characteristic regions of momentum-space,provides a consistent
explanation for the conductance modulations,without appeal to another
order parameter. These results refocusattention on quasiparticle
scattering processes as potential explanationsfor other incommensurate
phenomena in the cuprates. The momentum-resolvedtunneling spectroscopy
demonstrated here also provides a new techniquewith which to study
quasiparticles in correlated materials.
1 Department of Physics, University of
California, Berkeley, CA 94720-7300, USA.
2 Electromagnetic Technology Division, National
Institute of Standards and Technology, Boulder, CO 80305-3328, USA.
3 Department of Applied Physics, Stanford
University, Stanford, CA 94305-4090, USA.
4 Agency
of Industrial Science and Technology, 1-1-1 Central 2, Umezono,
Tsukuba, Ibaraki, 305-8568 Japan.
5 Department of
Superconductivity, University of Tokyo, Tokyo, 113-8656 Japan.
6 Materials Sciences Division, Lawrence Berkeley
National Laboratory, Berkeley, CA 94720, USA.
*
To whom correspondence should be addressed. E-mail:
jcdavis{at}socrates.berkeley.edu
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reveals weak, incommensurate, spatial modulations in the tunneling
conductance. Images of these energy-dependent modulations are Fourier
analyzed to yield the dispersion of their wavevectors. Comparison of
the dispersions with photoemission spectroscopy data indicates
that quasiparticle interference, due to elastic scattering between
characteristic regions of momentum-space, provides a consistent
explanation for the conductance modulations, without appeal to another
order parameter. These results refocus attention on quasiparticle
scattering processes as potential explanations for other incommensurate
phenomena in the cuprates. The momentum-resolved tunneling spectroscopy
demonstrated here also provides a new technique with which to study
quasiparticles in correlated materials.
