Emergence of interfacial magnetism in strongly-correlated nickelate-titanate superlattices
arxiv(2024)
Abstract
Strongly-correlated transition-metal oxides are widely known for their
various exotic phenomena. This is exemplified by rare-earth nickelates such as
LaNiO_3, which possess intimate interconnections between their electronic,
spin, and lattice degrees of freedom. Their properties can be further enhanced
by pairing them in hybrid heterostructures, which can lead to hidden phases and
emergent phenomena. An important example is the LaNiO_3/LaTiO_3
superlattice, where an interlayer electron transfer has been observed from
LaTiO_3 into LaNiO_3 and is predicted to result in a high-spin state.
However, macroscopic emergence of magnetic order has so far not been observed.
Here, by using muon spin rotation, x-ray absorption, and resonant inelastic
x-ray scattering, we present direct evidence of an emergent antiferromagnetic
order with high magnon energy and exchange interactions at the
LaNiO_3/LaTiO_3 interface. As the magnetism is purely interfacial, a
single LaNiO_3/LaTiO_3 interface can essentially behave as an
atomically thin quasi-two-dimensional antiferromagnet, potentially allowing its
technological utilisation in advanced spintronic devices. Furthermore, its
strong quasi-two-dimensional magnetic correlations and orbitally-polarized
planar ligand holes make its electronic and magnetic configurations resemble
the precursor states of superconducting cuprates and nickelates, but with an S
→ 1 spin state instead.
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