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Temperature dependence of the electron energy gap of high TC superconductors studied by work function spectroscopy

Work function measurements with the so‐called onset technique have been used to study the temperature‐dependent behavior of the electron energy gap of YBa2Cu3O7−x superconducting films. In the temperature range from TC down to 30 K a BCS‐like behavior with gap width 2Δ0 at T=0 between 38 and 62 meV is found.