THERMO-STIMULATED EXOEMISSION (TSEE) FROM GdBa2Cu3O7−x IN THE NORMAL STATE

Measurements of electron beam excited TSEE from the high T c superconductor GdBa 2 Cu 3 O 7−x were performed in the temperature range from 80 to 350 K. To prove that the emission peaks originate from the sample, the sample was covered with a film of KC1. Exoemission peaks at 160 K and 240 K most probably ascribed to the sample. They might be connected with the first-order phase transition discovered recently in this temperature region by another method. If we assume the existence of localized electrons at oxygen vacancies and a simple mechanism for their delocalization, we can calculate an activation energy.