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XXIV International Symposium Nanophysics and Nanoelectronics, Nizhny Novgorod, March 10-13, 2020
Superconductivity
Resonant current steps in Josephson structures with a layer from a material with strong spin–orbit interaction
K. Y. Constantiniana, G. A. Ovsyannikova, A. M. Petrzhika, A. V. Shadrinab, Yu. V. Kislinskiia, G. Cristianic, G. Logvenovc a Kotel'nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow
b Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region
c Max Planck Institute for Solid State Research,
Stuttgart, Germany
Abstract:
The microwave and magnetic parameters of Josephson Nb/Au/Sr$_{2}$IrO$_{4}$/YBa$_{2}$Cu$_{3}$O$_{x}$ mesastructures with a layer of Sr$_{2}$IrO$_{4}$, a material representing a Mott antiferromagnetic insulator with a high spin–orbit interaction energy $E_{\mathrm{SO}}\sim$ 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 $V_{n}$, 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 $V_{n}$ remained constant, and the amplitudes of resonant current steps nonmonotonically changed.
Keywords:
Josephson structure, spin-orbit interaction, strontium iridate, Fiske steps.
Received: 26.03.2020 Revised: 26.03.2020 Accepted: 02.04.2020
Citation:
K. Y. Constantinian, G. A. Ovsyannikov, A. M. Petrzhik, A. V. Shadrin, Yu. V. Kislinskii, G. Cristiani, G. Logvenov, “Resonant current steps in Josephson structures with a layer from a material with strong spin–orbit interaction”, Fizika Tverdogo Tela, 62:9 (2020), 1385–1389; Phys. Solid State, 62:9 (2020), 1549–1553
Linking options:
https://www.mathnet.ru/eng/ftt8306 https://www.mathnet.ru/eng/ftt/v62/i9/p1385
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