Abstract
Results of field electron emission spectroscopic investigations of YBa 2Cu 3O 6.9 single crystal specimens oriented perpendicular to the c-axis are presented. It is shown that the shift of the total energy distribution of field-emitted electrons from YBa 2Cu 3O 6.9 along the energy scale with increasing electric-field strength at the surface of the specimen is due to the penetration of the electric field into the subsurface region of the YBa 2Cu 3O 6.9 specimen. The electron concentration in YBa 2Cu 3O 6.9 found from spectroscopic measurements is n=(2−4) × 10 21 cm −3. Field electron emission spectroscopy and microscopy of YBa 2Cu 3O 6.9 allows one to draw the conclusion that the electron concentration in the bulk of the material does not change with cooling of specimens from 300 K to 115 K.
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