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Investigation of Josephson Contacts Pb0.6In0.4/KFe2As2 and KFe2As2/KFe2As2 and Order Parameter Symmetry Check

  • ORDER, DISORDER, AND PHASE TRANSITION IN CONDENSED SYSTEM
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Abstract

The characteristics of point Josephson contacts Pb0.6In0.4/KFe2As2 and KFe2As2/KFe2As2 have been studied. The temperature dependences of characteristic contact voltages VC(T) and the dependences of the first current step amplitudes in I–V characteristics on the power of 7.6-GHz electromagnetic radiation have been measured. It has been found that VC(T) curves for all contacts can be described in terms of the SIS*IS contact model (S, I, and S* stand for superconductor, insulator, and superconductor with a lower critical temperature, respectively) for superconductors with the s-symmetry of order parameter. It has been proved that the current step oscillation period as a function of microwave power can be exactly approximated with the resistive model of contact with IS = ICsin(φ). Obtained data are consistent with the normal s-symmetry of order parameter.

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Funding

This investigation was supported by the program of basic research “Quantum Effects in Condensed Matter at Supercritical Temperatures” at the Presidium of the Russian Academy of Sciences.

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Authors and Affiliations

  1. Lebedev Physical Institute, Russian Academy of Sciences, 119991, Moscow, Russia

    M. V. Golubkov, V. A. Stepanov, A. V. Sadakov & A. S. Usol’tsev

  2. National Research Technological University MISiS, 119049, Moscow, Russia

    M. V. Golubkov

  3. Moscow State University, 119991, Moscow, Russia

    I. V. Morozov

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  1. M. V. Golubkov
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  2. V. A. Stepanov
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  3. A. V. Sadakov
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  4. A. S. Usol’tsev
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Correspondence to M. V. Golubkov.

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Translated by V. Isaakyan

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Golubkov, M.V., Stepanov, V.A., Sadakov, A.V. et al. Investigation of Josephson Contacts Pb0.6In0.4/KFe2As2 and KFe2As2/KFe2As2 and Order Parameter Symmetry Check. J. Exp. Theor. Phys. 136, 155–162 (2023). https://doi.org/10.1134/S1063776123020085

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