Cooper-Pair Spin Current in a Strontium Ruthenate Heterostructure

Suk Bum Chung; Se Kwon Kim; Ki Hoon Lee; Yaroslav Tserkovnyak

doi:10.1103/PhysRevLett.121.167001

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Cooper-Pair Spin Current in a Strontium Ruthenate Heterostructure

Suk Bum Chung, Se Kwon Kim, Ki Hoon Lee, Yaroslav Tserkovnyak

DOI 10.1103/PhysRevLett.121.167001 · Physical Review Letters

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Abstract

It has been recognized that the condensation of spin-triplet Cooper pairs requires not only broken gauge symmetry but also spin ordering as well. One consequence of this is the possibility of a Cooper-pair spin current analogous to the magnon spin current in magnetic insulators, the analogy also extending to the existence of the Gilbert damping of the collective spin-triplet dynamics. The recently fabricated heterostructure of the thin film of the itinerant ferromagnet SrRuO3 on bulk Sr2RuO4, the best-known candidate material for a spin-triplet superconductor, offers a promising platform for generating such spin current. We show how such heterostructure allows us to not only realize the long-range spin valve but also electrically drive the collective spin mode of the spin-triplet order parameter. Our proposal represents both a novel experimental realization of superfluid spin transport and a transport signature of the spin-triplet superconductivity therein.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure not reported	unknown