Spin-triplet electron transport in hybrid superconductor heterostructures with a composite ferromagnetic interlayer
Journal article, 2015

Hybrid YBa2Cu3O7 - x /SrRuO3/La0.7Sr0.3MnO3/Au-Nb superconductor mesastructures with a composite manganite-ruthenate ferromagnetic interlayer are studied using electrophysical, magnetic, and microwave methods. The supercurrent in the mesastructure is observed when the interlayer thickness is much larger than the coherence length of ferromagnetic materials. The peak on the dependence of the critical current density on the interlayer material thickness corresponds to the coherence length, which is in qualitative agreement with theoretical predictions for a system with spit-triplet superconducting correlations. The magnetic-field dependence of the critical current is determined by penetration of magnetic flux quanta and by the magnetic domain structure, as well as by the field dependence of disorientation of the magnetization vectors of the layers in the composite magnetic interlayer. It is found that the supercurrent exists in magnetic fields two orders of magnitude stronger than the field corresponding to entry of a magnetic flux quantum into the mesastructure. The current-phase relation (CPR) of the supercurrent of mesastructures is investigated upon a change in the magnetic field from zero to 30 Oe; the ratio of the second CPR harmonic to the first, determined from the dependence of the Shapiro steps on the microwave radiation amplitude, does not exceed 50%.

Author

A. E. Sheyerman

Moscow Institute of Physics and Technology

National Research University of Electronic Technology (MIET)

K. Y. Constantinian

National Research University of Electronic Technology (MIET)

Gennady Ovsyannikov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Yu V. Kislinskiǐ

National Research University of Electronic Technology (MIET)

A. V. Shadrin

National Research University of Electronic Technology (MIET)

Moscow Institute of Physics and Technology

Alexei Kalaboukhov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Y. N. Khaydukov

Max Planck Institute

Journal of Experimental and Theoretical Physics

1063-7761 (ISSN) 1090-6509 (eISSN)

Vol. 120 6 1024-1033

Subject Categories

Subatomic Physics

DOI

10.1134/S1063776115050192

More information

Latest update

2/21/2018