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Anomalous Ferromagnetism of quasiparticle doped holes in cuprate heterostructures revealed using resonant soft X-ray magnetic scattering

Author

Listed:
  • B. L. Ong

    (National University of Singapore, 2 Science Drive 3
    National University of Singapore, 5 Research Link)

  • K. Jayaraman

    (National University of Singapore, 2 Science Drive 3
    National University of Singapore, 5 Research Link)

  • C. Diao

    (National University of Singapore, 5 Research Link)

  • T. J. Whitcher

    (National University of Singapore, 2 Science Drive 3
    National University of Singapore, 5 Research Link)

  • A. Jain

    (National University of Singapore, 2 Science Drive 3
    National University of Singapore, 5 Research Link)

  • H. Hung

    (National University of Singapore, 2 Science Drive 3)

  • M. B. H. Breese

    (National University of Singapore, 2 Science Drive 3
    National University of Singapore, 5 Research Link)

  • E. S. Tok

    (National University of Singapore, 2 Science Drive 3)

  • A. Rusydi

    (National University of Singapore, 2 Science Drive 3
    National University of Singapore, 5 Research Link
    National University of Singapore, 6 Science Drive 2
    NUS Graduate School for Integrative Sciences and Engineering)

Abstract

We report strong ferromagnetism of quasiparticle doped holes both within the ab-plane and along the c-axis of Cu-O planes in low-dimensional Au/d-La1.8Ba0.2CuO4/LaAlO3(001) heterostructures (d = 4, 8 and 12 unit-cells) using resonant soft X-ray and magnetic scattering together with X-ray magnetic circular dichroism. Interestingly, ferromagnetism is stronger at a hole doped peak and at an upper Hubbard band of O with spin-polarization degree as high as 40%, revealing strong ferromagnetism of Mottness. For in-ab-plane spin-polarizations, the spin of doped holes in O2p–Cu3d–O2p is a triplet state yielding strong ferromagnetism. For out-of-ab-plane spin-polarization, while the spins of doped holes in both O2p–O2p and Cu3d–Cu3d are triplet states, the spin of doped holes in Cu3d–O2p is a singlet state yielding ferrimagnetism. A ferromagnetic-(002) Bragg-peak of the doped holes is observed and enhanced as a function of d revealing strong ferromagnetism coupling between Cu-O layers along the c-axis.

Suggested Citation

  • B. L. Ong & K. Jayaraman & C. Diao & T. J. Whitcher & A. Jain & H. Hung & M. B. H. Breese & E. S. Tok & A. Rusydi, 2022. "Anomalous Ferromagnetism of quasiparticle doped holes in cuprate heterostructures revealed using resonant soft X-ray magnetic scattering," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31885-1
    DOI: 10.1038/s41467-022-31885-1
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    References listed on IDEAS

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