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We have investigated subharmonic energy-gap structures (SGSs) and 1/f noise spectra in Nb/Al+AlO x /Nb tunnel junctions as a function of bias voltage. The clear SGSs were observed in dV/dI vs. V curves at 4.2 K. The quasiparticle characteristic was explained by the Octavio, Tinkham, Blonder and Klapwijk theory based on multiple-Andreev reflection model. To estimate the 1/f noise parameter...
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