Electronic Excitations of YBa sub 2 Cu sub 3 O sub (7-x) Superconductor: A Study by Transmission Electron Energy Loss Spectroscopy with an Electron Microbe.

Interband and core level transitions and plasmon resonance in the high temperature oxide superconductor, YBa sub 2 Cu sub 3 O sub (7-x), were studied by transmission electron energy loss spectroscopy using an electron microprobe~5-10 angstroms in size. Both single crystal and polycrystalline ceramics samples have been examined. No significant change in electronic structure was observed at the grain boundaries. A 13.5eV interband transition peak was found to be sensitive to damages created by ion beam bombardment.