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TEM image of the tunnel junction cross section with a Nb-oxide layer in the middle oxidized for .
vs of the junctions with a barrier oxidized for 1, 3, 5, and . The inset represents a magnified plot in the high temperature region. The dashed lines are a fit to Eq. (4).
(a) Examples of the measured (open circles) and fitted [Eqs. (5) and (1), solid lines] curves for the data of Fig. 2 in the high temperature region. The fitted parameters: and . (b) Values of the barrier thickness and height extracted from thermionic emission current fitting [Eqs. (5) and (1)] as a function of the oxidation time (open squares). For comparison, the values of the barrier thickness estimated from TEM images are also shown (solid squares).
characteristics for an all-Nb SET at in the normal state at . Clear Coulomb diamond structures are observed near the origin.
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