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Nonmonotonous temperature dependence of Shapiro steps in YBCO grain boundary junctions
Leonid S Revin1,2, Dmitriy V Masterov1, Alexey E Parafin1
1Institute for Physics of Microstructures of RAS, GSP-105, Nizhny Novgorod, 603950, Russia.
Abstract:
The amplitudes of the first Shapiro steps for an external signal with frequencies of 72 and 265 GHz are measured as function of the temperature from 20 to 80 K for a 6 μm Josephson grain boundary junction fabricated by YBaCuO film deposition on an yttria-stabilized zirconia bicrystal substrate. Non-monotonic dependences of step heights for different external signal frequencies were found in the limit of a weak driving signal, with the maxima occurring at different points as function of the temperature. The step heights are in agreement with the calculations based on the resistively-capacitively shunted junction model and Bessel theory. The emergence of the receiving optima is explained by the mutual influence of the varying critical current and the characteristic frequency.
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