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Spin-orbit coupling suppression and singlet-state blocking of spin-triplet Cooper pairs


Abstract
An inhomogeneous magnetic exchange field at a superconductor/ferromagnet interface converts spin-singlet Cooper pairs to a spin-polarized triplet state. Although the decay envelope of triplet pairs within ferromagnetic materials is well studied, little is known about their decay in nonmagnetic metals and superconductors and, in particular, in the presence of spin-orbit coupling (SOC). Here, we investigate devices in which singlet and triplet supercurrents propagate into the s-wave superconductor Nb. In the normal state of Nb, triplet supercurrents decay over a distance of 5 nm, which is an order of magnitude smaller than the decay of spin-singlet pairs due to the SOC. In the superconducting state of Nb, triplet supercurrents are not able to couple with the singlet wave function and are thus blocked by the absence of available equilibrium states in the singlet gap. The results offer insight into the dynamics between s-wave singlet and s-wave triplet states. ....

Cryogenic Ltd , Co Ru , Programme Grant Superspin , International Network Grant Oxide Superspin , Russian Science Foundation , Programme Fostering Globally Talented Researchers , Spin Triplet Cooper , Zeiss Crossbeam , Creative Commons Attribution , Network Grant , Globally Talented , Russian Presidential Scholarship , கிரையோஜெனிக் லிமிடெட் , இணை ரு , ரஷ்ய அறிவியல் அடித்தளம் , ப்ரோக்ராம் வளர்ப்பதற்கு உலகளவில் திறமையானவர்கள் ஆராய்ச்சியாளர்கள் , சுழல் மும்மடங்கு கூப்பர் , வலைப்பின்னல் மானியம் , உலகளவில் திறமையானவர்கள் , ரஷ்ய ப்ரெஸிடெந்ஶியல் உதவித்தொகை ,