Abstract
The microwave and magnetic parameters of Josephson Nb/Au/Sr2IrO4/YBa2Cu3Ox mesastructures with a layer of Sr2IrO4, a material representing a Mott antiferromagnetic insulator with a high spin–orbit interaction energy ESO ~ 0.4 eV, were studied. Shapiro steps, oscillating with radiation power, appeared under monochromatic electromagnetic radiation confirm the Josephson properties of these structures. In the presence of a weak magnetic field H < 15 Oe, the voltage–current characteristics (VCCs) had resonant current steps at voltages Vn, which were inversely proportional to the size L of structures in plane. Polarity reversal in the electrical current I led to asymmetry in the arrangement of resonant current steps. At a specified magnetic field H, the voltage Vn remained constant, and the amplitudes of resonant current steps nonmonotonically changed.
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ACKNOWLEDGMENTS
The authors are grateful to A.V. Zaitsev and V.P. Koshelets for fruitful discussions.
Funding
This work was performed within the state task and supported in part by the Russian Foundation for Basic Research (project no. 19-07-00274).
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Translated by E. Glushachenkova
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Constantinian, K.Y., Ovsyannikov, G.A., Petrzhik, A.M. et al. Resonant Current Steps in Josephson Structures with a Layer from a Material with Strong Spin–Orbit Interaction. Phys. Solid State 62, 1549–1553 (2020). https://doi.org/10.1134/S1063783420090152
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DOI: https://doi.org/10.1134/S1063783420090152