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Josephson effect in FeSe point contacts
Russian version
Golubkov M. V. 1, Stepanov V. A. 1, Sadakov A. V. 1, Usoltsev A.S. 1, Chareev D. A. 2,3,4
1Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
2
3Dubna State University, Dubna, Moscow region, Russia
4
Email: golubkov@lebedev.ru
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The paper presents the results of studies of PbIn/FeSe and FeSe/FeSe Josephson point contacts tuned in helium with critical currents IC(4.2 K)=1.80-0.43 mA and characteristic voltages VC(4.2 K)=0.057-0.144 mV. The dependences of VC of contacts on temperature T and the dependences of the amplitudes of the current steps on the current-voltage characteristics on the power of electromagnetic radiation PMW with a frequency of 8 GHz were measured. The VC(T) dependences were well approximated by the known models of SS'S, SIS contacts. The dependences of the amplitudes of the first steps of the contact current on PMW were described by a resistive model with a current proportional to sin(φ) with a normalized frequency of microwave radiation found from the oscillation period of the current steps. The obtained results unambiguously indicated the usual s - symmetry of the order parameters in the FeSe bands Keywords: iron-based superconductors, order parameter, Josephson effect, resistive model.
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