Observation of Mermin-Wagner behavior in LaFeO3/SrTiO3 superlattices

M. Kiaba (), A. Suter, Z. Salman, T. Prokscha, B. Chen, G. Koster and A. Dubroka
Additional contact information
M. Kiaba: Masaryk University
A. Suter: Paul Scherrer Institute
Z. Salman: Paul Scherrer Institute
T. Prokscha: Paul Scherrer Institute
B. Chen: East China Normal University
G. Koster: University of Twente
A. Dubroka: Masaryk University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-49518-0

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