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Imaging Quasiparticle Interference in Bi 2 Sr 2 CaCu 2 O 8+δ

2002; American Association for the Advancement of Science; Volume: 297; Issue: 5584 Linguagem: Inglês

10.1126/science.1072640

1095-9203

Jennifer E. Hoffman, K. McElroy, D.-H. Lee, Kyle M. Lang, Hiroshi Eisaki, S. Uchida, J. C. Davis,

Iron-based superconductors research

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.