Substitution of Chromium for Univalent Copper in Superconducting Pb2Sr2(Ca,Y)Cu3O8+δStudy Of The Electronic Structures Of High Tc Cuprate Superconductors By Electron Energy Loss And Secondary Electron Emission Spectroscopies

Abstract

Energy loss spectra of superconducting YBa2Cu3O6.9' Bi1.5Pb0.5Ca2.5Sr1.5Cu3O10+δ and Tl2CaBa2Cu3O8 obtained at primary electron energies in the 170–310 eV range show features reflecting the commonalities in their electronic structures. The relative intensity of the plasmon peak shows a marked drop across the transition temperature. Secondary electron emission spectra of the cuprates also reveal some features of the electronic structure.