AVS 49th International Symposium
    Surface Science Wednesday Sessions
       Session SS-WeP

Paper SS-WeP24
Electronic Friction at the High T@sub c@ Superconductor-Adsorbate Interface

Wednesday, November 6, 2002, 11:00 am, Room Exhibit Hall B2

Session: Surface Science Poster Session
Presenter: X.F. Hu, University of Wisconsin-Milwaukee
Authors: X.F. Hu, University of Wisconsin-Milwaukee
P. Guptasarma, University of Wisconsin-Milwaukee
R.W.C. Hansen, Synchrotron Radiation Center
C.J. Hirschmugl, University of Wisconsin-Milwaukee
Correspondent: Click to Email
Electronic friction at a substrate-adsorbate interface can be examined using grazing incidence Infrared Reflection Absorption Spectroscopy (IRAS). Adsorbed molecules provide extra scattering sites for substrate electrons in metallic substrates with electron mean free paths longer than the skin depth. This electron energy loss is observed as a broad absorption feature in the change in reflectivity with and without adsorbates. In superconductors, substrate electrons have varying mean free paths above and below the superconducting transition temperature. We will present IRAS results for CO adsorbed on surfaces parallel to and perpendicular to the ab-plane in near-optimal doped (Tc ~ 95K) large single crystals of Bi@sub 2@Sr@sub 2@CaCu@sub 2@O@sub 8+y@ (BSCCO). The single crystal was grown by the float-zone technique in an infrared image furnace. Measurements were taken both above and below the superconducting transition temperature at the Synchrotron Radiation Center.