Abstract
The oscillating dependence of the differential resistance of point contacts (Cu–SmBa2Cu3O7–δ) on the bias voltage is shown to be a harmonic gap structure with several energy gaps. The presence of a set of energy gaps is explained by the existence of clusters with different oxygen concentrations in the contact region. The temperature dependence of energy gaps is not consistent with the BCS theory, and 2Δ/kTc ≈ 6–8. It is found that a weak magnetic field considerably affects the harmonic gap structure.
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