Bias Current Dependence of the Work Function of the Oxide Superconductor, Bi₂Sr₂CaCu₂O₈ Cleaved at Low Temperature

Abstract

Bias current dependence of the work function of the Bi₂Sr₂CaCu₂O₈ cleaved at about 30 K was measured by means of Kelvin-Zisman automatic method. In the superconductive state, the work function roses nonlinearly, and the temperature gradient of the work function also roses and became almost constant with the increase in the bias current. These results were discussed from the viewpoint of the contribution of the Fermi-energy and the surface dipole barrier.