Observation of Mermin-Wagner behavior in LaFeO_3/SrTiO_3 superlattices
arxiv(2024)
摘要
Two-dimensional magnetic materials attract a lot of attention since they
potentially exhibit new magnetic properties due to, e.g., strongly enhanced
spin fluctuations. 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 LaFeO_3 and SrTiO_3 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 LaFeO_3
exhibit a static antiferromagnetic order. In contrast, in the superlattices
with single LaFeO_3 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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