Abstract
We report on the characterization of the dynamic (ac) properties of YBa/sub 2/Cu/sub 3/O/sub 7/ Josephson junctions on MgO bicrystal substrates with 24/spl deg/ angle. Shapiro steps have been measured in the frequency range 80-95 GHz. Measured current-voltage characteristics, as well as the dependence of Shapiro step height on microwave power, were compared to numerical simulations within the RSJ model including thermal noise. At 77 K, the junctions showed ideal RSJ behavior. The occurrence of half-integer Shapiro steps at lower temperatures could be explained by an inhomogeneous critical current density of the junctions yielding a dc SQUID-like behavior. A nonsinusoidal current-phase relation could be ruled out because of the periodicity of the half-integer steps.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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