Nonmonotonous temperature dependence of Shapiro steps in YBCO grain boundary junctions

Beilstein Journal of Nanotechnology

article

Leonid S. Revin¹  Dmitriy V. Masterov¹  Alexey E. Parafin¹  Sergey A. Pavlov¹  Andrey L. Pankratov¹ 

[1] Institute for Physics of Microstructures of RAS;Center of Quantum Technologies, Nizhny Novgorod State Technical University;Lobachevsky State University of Nizhny Novgorod

关键词: characteristic frequency;    Shapiro steps;    temperature dependence;    YBaCuO Josephson junction;   

DOI  :  10.3762/bjnano.12.95

学科分类：环境监测和分析

来源: Beilstein - Institut zur Foerderung der Chemischen Wissenschaften

【 摘 要 】

The amplitudes of the first Shapiro steps for an external signal with frequencies of 72 and 265 GHz are measured as function of thetemperature from 20 to 80 K for a 6 μm Josephson grain boundary junction fabricated by YBaCuO film deposition on an yttriastabilized zirconia bicrystal substrate. Non-monotonic dependences of step heights for different external signal frequencies werefound in the limit of a weak driving signal, with the maxima occurring at different points as function of the temperature. The stepheights are in agreement with the calculations based on the resistively–capacitively shunted junction model and Bessel theory. Theemergence of the receiving optima is explained by the mutual influence of the varying critical current and the characteristic frequency.

【 授权许可】

CC BY