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

• DOI: 10.1126/science.1072640
• Publication Date: 2002-10-01T19:34:46Z
• Authors: J. E. Hoffman; K. McElroy; D.-H. Lee; K. M Lang; H. Eisaki; S. Uchida; J. C. Davis
• Keywords: Superconductivity (cond-mat.supr-con); Condensed Matter - Superconductivity; 0103 physical sciences; FOS: Physical sciences; 01 natural sciences

Scanning tunneling spectroscopy of the high-Tc superconductor Bi2Sr2CaCu2O8+delta reveals weak, incommensurate, spatial modulations in conductance. Images these energy-dependent are Fourier analyzed to yield dispersion their wavevectors. Comparison dispersions with photoemission data indicates that quasiparticle interference, due elastic scattering between characteristic regions momentum-space, provides a consistent explanation for conductance modulations, without appeal another order parameter. These results refocus attention on processes as potential explanations other incommensurate phenomena cuprates. The momentum-resolved demonstrated here also new technique which study quasiparticles correlated materials.