Atomic-Scale Quasi-Particle Scattering Resonances in Bi 2 Sr 2 CaCu 2 O 8+δ
- 2 July 1999
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 285 (5424), 88-91
- https://doi.org/10.1126/science.285.5424.88
Abstract
Low-temperature scanning tunneling spectroscopy of the high transition temperature (high- T c ) cuprate Bi 2 Sr 2 CaCu 2 O 8+δ reveals 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 Bi 2 Sr 2 CaCu 2 O 8+δ at low temperatures.Keywords
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