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Published Online July 25, 2002
Science DOI: 10.1126/science.1072640

Reports

Submitted on April 8, 2002
Accepted on June 13, 2002

Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+{delta}

J. E. Hoffman 1, K. McElroy 1, D.-H. Lee 2, K. M Lang 3, H. Eisaki 4, S. Uchida 5, J. C. Davis 2*

1 Department of Physics, University of California, Berkeley, CA 94720-7300, USA.
2 Department of Physics, University of California, Berkeley, CA 94720-7300, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3 Department of Physics, University of California, Berkeley, CA 94720-7300, USA; Electromagnetic Technology Division, NIST, Boulder, CO 80305-3328, USA.
4 Department of Applied Physics, Stanford University, Stanford, CA 94305-4090, USA; Agency of Industrial Science and Technology, 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki, 305-8568 Japan; Department of Superconductivity, University of Tokyo, Tokyo, 113-8656 Japan.
5 Department of Superconductivity, University of Tokyo, Tokyo, 113-8656 Japan.

Scanning tunneling spectroscopy of the high-Tc superconductor Bi2Sr2CaCu2O8+{delta} 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.


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