Cooper-Pair Spin Current in a Strontium Ruthenate Heterostructure

Suk Bum Chung, Se Kwon Kim, Ki Hoon Lee, and Yaroslav Tserkovnyak
Phys. Rev. Lett. 121, 167001 – Published 16 October 2018

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.

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  • Received 2 February 2018
  • Revised 5 July 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.167001

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Suk Bum Chung1,2,3,4,*, Se Kwon Kim5,6,†, Ki Hoon Lee3,4, and Yaroslav Tserkovnyak5

  • 1Department of Physics, University of Seoul, Seoul 02504, Korea
  • 2Natural Science Research Institute, University of Seoul, Seoul 02504, Korea
  • 3Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul National University, Seoul 08826, Korea
  • 4Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
  • 5Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
  • 6Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA

  • *sbchung0@uos.ac.kr
  • evol@physics.ucla.edu, kimsek@missouri.edu

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Issue

Vol. 121, Iss. 16 — 19 October 2018

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