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

B. L. Ong, K. Jayaraman, C. Diao, T. J. Whitcher, A. Jain, H. Hung, M. B. H. Breese, E. S. Tok and A. Rusydi ()
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B. L. Ong: National University of Singapore, 2 Science Drive 3
K. Jayaraman: National University of Singapore, 2 Science Drive 3
C. Diao: National University of Singapore, 5 Research Link
T. J. Whitcher: National University of Singapore, 2 Science Drive 3
A. Jain: National University of Singapore, 2 Science Drive 3
H. Hung: National University of Singapore, 2 Science Drive 3
M. B. H. Breese: National University of Singapore, 2 Science Drive 3
E. S. Tok: National University of Singapore, 2 Science Drive 3
A. Rusydi: National University of Singapore, 2 Science Drive 3

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-31885-1

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