Observation of Mermin-Wagner behavior in LaFeO<sub>3</sub>/SrTiO<sub>3</sub> superlattices
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Date
2024-06-22
Authors
Kiaba, Michal
Suter, Andreas
Salman, Zaher
Prokscha, Thomas
Chen, B.
Koster, Gertjan
Dubroka, Adam
ORCID
Advisor
Referee
Mark
Journal Title
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Volume Title
Publisher
NATURE PORTFOLIO
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Abstract
Two-dimensional magnetic materials can exhibit new magnetic properties due to the enhanced spin fluctuations that arise in reduced dimension. However, the suppression of the long-range magnetic order in two dimensions due to long-wavelength spin fluctuations, as suggested by the Mermin-Wagner theorem, has been questioned for finite-size laboratory samples. Here we study the magnetic properties of a dimensional crossover in superlattices composed of the antiferromagnetic LaFeO3 and SrTiO3 that, thanks to their large lateral size, allowed examination using a sensitive magnetic probe - muon spin rotation spectroscopy. We show that the iron electronic moments in superlattices with 3 and 2 monolayers of LaFeO3 exhibit a static antiferromagnetic order. In contrast, in the superlattices with single LaFeO3 monolayer, the moments do not order and fluctuate to the lowest measured temperature as expected from the Mermin-Wagner theorem. Our work shows how dimensionality can be used to tune the magnetic properties of ultrathin films.
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Citation
NATURE COMMUNICATIONS. 2024, vol. 15, issue 1, p. 1-7.
https://www.nature.com/articles/s41467-024-49518-0
https://www.nature.com/articles/s41467-024-49518-0
Document type
Peer-reviewed
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Published version
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en