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arXiv · 1802.01599

Cooper-Pair Spin Current in a Strontium Ruthenate Heterostructure

Suk Bum Chung·Se Kwon Kim·Ki Hoon Lee·Yaroslav Tserkovnyak
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Abstract

It has been recognized that the condensation of spin-triplet Cooper pairs requires not only the broken gauge symmetry but also the spin ordering as well. One consequence of this is the possibility of the 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 the bulk Sr2RuO4, the best-known candidate material for the spin-triplet superconductor, offers a promising platform for generating such spin current. We will 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 new realization of the spin superfluidity and a transport signature of the spin-triplet superconductivity.

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Suk Bum Chung, Se Kwon Kim, Ki Hoon Lee, Yaroslav Tserkovnyak. 2018-02-05. Cooper-Pair Spin Current in a Strontium Ruthenate Heterostructure. https://doi.org/10.1103/physrevlett.121.167001

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