Publikationsdatum:
1999-07-03
Beschreibung:
Low-temperature scanning tunneling spectroscopy of the high transition temperature (high-Tc) cuprate Bi2Sr2CaCu2O8+delta 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 Bi2Sr2CaCu2O8+delta at low temperatures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hudson -- Pan -- Gupta -- Ng -- Davis -- New York, N.Y. -- Science. 1999 Jul 2;285(5424):88-91.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, University of California, Berkeley, CA, 94720-7300, USA. Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10390368" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Digitale ISSN:
1095-9203
Thema:
Biologie
,
Chemie und Pharmazie
,
Informatik
,
Medizin
,
Allgemeine Naturwissenschaft
,
Physik
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