Physics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kcs..confe...4d&link_type=abstract
Presented at the KITP: Colloquium Series, Apr 26, 2000, Kavli Institute for Theoretical Physics, University of California, Santa
Physics
Scientific paper
Dr. Davis will describe his recent studies of the High-TC SuperconductorBiSrCaCuO, using a high resolution very low temperature STM, in whichsingle impurity atoms were used to probe the structure of thesuperconducting order parameter and the correlation between electrons.Quasiparticle scattering at impurities generates localized impurity statesat the atmoic scale. Imaging these impurity states with individual(non-magnetic) Zinc dopant atoms at the Copper site in the Copper-Oxideplane shows several direct real-space consequences of the d-wave nature ofthe order parameter. The spectra are in qualitative agreement with d-waveBCS theories of non-magnetic quasiparticle scattering at a single impurityatom. The destruction of superconductivity within 1.5 nm of the Zn sitesis observed. He will also discuss very new results of imaging of theimpurity states associated with individual Nickel dopant atoms (magnetic)substituted at the Copper site, which show numerous new atomic-scalephenomena which, although partially consistent with theory for magneticimpurity atom scattering in a d-wave BCS context, are not fully describedby existing theories.
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