Report

Atomic-Scale Quasi-Particle Scattering Resonances in Bi2Sr2CaCu2O8+δ

Science  02 Jul 1999:
Vol. 285, Issue 5424, pp. 88-91
DOI: 10.1126/science.285.5424.88

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Abstract

Low-temperature scanning tunneling spectroscopy of the high transition temperature (high-T c) cuprate Bi2Sr2CaCu2O8+δreveals the existence of large numbers of identical regions with diameters of about 3 nanometers that have a relatively high density of low-energy quasi-particle states. Their spatial and spectroscopic characteristics are consistent with theories of strong quasi-particle scattering from atomic-scale impurities in a d-wave superconductor. These characteristics include breaking of local particle-hole symmetry, a diameter near twice the superconducting coherence length, and an inverse square dependence of their local density-of-states on distance from the scattering center. In addition to the validation of d-wave quasi-particle scattering theories, these observations identify a source for the anomalously high levels of low-energy quasi-particles in Bi2Sr2CaCu2O8+δ at low temperatures.

  • * Present address: Department of Physics, Boston University, Boston, MA, 02215, USA.

  • To whom correspondence should be addressed. E-mail: jcdavis{at}socrates.berkeley.edu

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