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journal article·2024-09Open access

Emergence of Interfacial Magnetism in Strongly‐Correlated Nickelate‐Titanate Superlattices

Teguh Citra Asmara, Robert J. Green, Andreas Suter, Yuan Wei, Wenliang Zhang, Daniel Knez, Grant Harris, Yi Tseng, Tianlun Yu, Davide Betto, Mirian Garcia‐Fernandez, Stefano Agrestini, Yannick Maximilian Klein, Neeraj Kumar, Carlos William Galdino, Zaher Salman, Thomas Prokscha, Marisa Medarde, Elisabeth Müller, Yona Soh, Nicholas B. Brookes, Ke‐Jin Zhou, Milan Radovic, Thorsten Schmitt

Advanced Materials· Volume 36· Issue 38
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Abstract

Abstract Strongly‐correlated transition‐metal oxides are widely known for their various exotic phenomena. This is exemplified by rare‐earth nickelates such as LaNiO3, 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 LaNiO3/LaTiO3 superlattice, where an interlayer electron transfer has been observed from LaTiO3 into LaNiO3 leading to a high‐spin state. However, macroscopic emergence of magnetic order associated with this high‐spin state has so far not been observed. Here, by using muon spin rotation, x‐ray absorption, and resonant inelastic x‐ray scattering, direct evidence of an emergent antiferromagnetic order with high magnon energy and exchange interactions at the LaNiO3/LaTiO3 interface is presented. As the magnetism is purely interfacial, a single LaNiO3/LaTiO3 interface can essentially behave as an atomically thin strongly‐correlated quasi‐2D antiferromagnet, potentially allowing its technological utilization in advanced spintronic devices. Furthermore, its strong quasi‐2D magnetic correlations, orbitally‐polarized planar ligand holes, and layered superlattice design make its electronic, magnetic, and lattice configurations resemble the precursor states of superconducting cuprates and nickelates, but with an S→1 spin state instead.
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Research context

OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Electronic and Structural Properties of Oxides · Advanced Condensed Matter Physics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

PSI Center for Photon Science Paul Scherrer Institute Forschungsstrasse 111 Villigen PSI CH‐5232 Switzerland

European X‐Ray Free‐Electron Laser Facility GmbH Holzkoppel 4 22869 Schenefeld Germany

Department of Physics & Engineering Physics University of Saskatchewan 116 Science Place Saskatoon SK S7N 5E2 Canada

Stewart Blusson Quantum Matter Institute University of British Columbia 2355 East Mall Vancouver BC V6T 1Z4 Canada

Laboratory for Muon‐Spin Spectroscopy Paul Scherrer Institute Forschungsstrasse 111 Villigen PSI CH‐5232 Switzerland

Institute of Electron Microscopy and Nanoanalysis Graz University of Technology Steyrergasse 17 Graz 8010 Austria

European Synchrotron Radiation Facility 71, avenue des Martyrs, Cedex 9 Grenoble F‐38043 France

Diamond Light Source Harwell Science and Innovation Campus Didcot Oxfordshire OX11 0DE UK

Laboratory for Multiscale Materials Experiments Paul Scherrer Institute Forschungsstrasse 111 Villigen PSI CH‐5232 Switzerland

Paul Scherrer Institute Forschungsstrasse 111 Villigen PSI CH‐5232 Switzerland

Electron Microscopy Facility Paul Scherrer Institut Forschungsstrasse 111 Villigen PSI CH‐5232 Switzerland

Funding

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung · H2020 European Research Council

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