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Strain-tuned incompatible magnetic exchange-interaction in La2NiO4

Authors :
Izabela Biało
Leonardo Martinelli
Gabriele De Luca
Paul Worm
Annabella Drewanowski
Simon Jöhr
Jaewon Choi
Mirian Garcia-Fernandez
Stefano Agrestini
Ke-Jin Zhou
Kurt Kummer
Nicholas B. Brookes
Luo Guo
Anthony Edgeton
Chang B. Eom
Jan M. Tomczak
Karsten Held
Marta Gibert
Qisi Wang
Johan Chang
Source :
Communications Physics, Vol 7, Iss 1, Pp 1-7 (2024)
Publication Year :
2024
Publisher :
Nature Portfolio, 2024.

Abstract

Abstract Magnetic frustration is a route for novel ground states, including spin liquids and spin ices. Such frustration can be introduced through either lattice geometry or incompatible exchange interactions. Here, we find that epitaxial strain is an effective tool for tuning antiferromagnetic exchange interactions in a square-lattice system. By studying the magnon excitations in La2NiO4 films using resonant inelastic x-ray scattering, we show that the magnon displays substantial dispersion along the antiferromagnetic zone boundary, at energies that depend on the lattice of the film’s substrate. Using first principles simulations and an effective spin model, we demonstrate that the antiferromagnetic next-nearest neighbour coupling is a consequence of the two-orbital nature of La2NiO4. Altogether, we illustrate that compressive epitaxial strain enhances this coupling and, as a result, increases the level of incompatibility between exchange interactions within a model square-lattice system.

Details

Language :
English
ISSN :
23993650
Volume :
7
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Communications Physics
Publication Type :
Academic Journal
Accession number :
edsdoj.2b0850215af54e5e912c1065ae2d101f
Document Type :
article
Full Text :
https://doi.org/10.1038/s42005-024-01701-x