Abstract
The first different-temperature field electron emission spectra, field electron emission microimages and current-voltage characteristics of a clean surface of perfect YBa 2Cu 3O 6.9 single crystals oriented in the [100] direction are presented. Field electron emission patterns of YBa 2Cu 3O 6.9 single crystals do not change during the course of cooling from 300 to 115 K. Similarly to metals, the rate of increase at the Fermi edge of the field electron emission spectrum of YBa 2Cu 3O 6.9 increases with cooling. At the same time some peculiar features not typical of metals are observed in the behaviour of field electron spectra and current-voltage characteristics. The results of measurements showed that the investigations of electronic properties of field evaporated cleaned surfaces of oxide superconductors can be carried out by field emission methods in a wide range of temperatures, up to 300 K.
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