Manifestation of a clear gap structure from point-contact and tunneling spectroscopy of YBa2Cu3O7-x and YbBa2Cu3O7-x single crystalsстатья
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Аннотация:Methods of point-contact and tunneling spectroscopy have been used to determine the gap parameter Δ for single crystals of YBa2Cu3O7−x and YbBa2Cu3O7−x with critical temperature 60 K ≤Tc≤90 K. Sharp dips of the dynamic conductance dI/dV of point contacts at voltages Vn=2Δ/(en) (n≤8–9), as well as a clear gap structure in the I(V) characteristics of tunnel junctions give convincing evidence for the existence of a true superconducting gap in YBa2Cu3O7−x and YbBa2Cu3O7−x single crystals at least at T≪Tc, as in conventional superconductors.