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

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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.

About the authors

M. V Golubkov

Lebedev Physical Institute, Russian Academy of Sciences; National Research Technological University MISiS

Email: golubkov@lebedev.ru
119991, Moscow, Russia; 119049, Moscow, Russia

V. A Stepanov

Lebedev Physical Institute, Russian Academy of Sciences

Email: golubkov@lebedev.ru
119991, Moscow, Russia

A. V Sadakov

Lebedev Physical Institute, Russian Academy of Sciences

Email: golubkov@lebedev.ru
119991, Moscow, Russia

A. S Usol'tsev

Lebedev Physical Institute, Russian Academy of Sciences

Email: golubkov@lebedev.ru
119991, Moscow, Russia

I. V Morozov

Moscow State University

Author for correspondence.
Email: golubkov@lebedev.ru
119049, Moscow, Russia

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