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Lee, Suheon; Zhu, Tianyu; Oshima, Yoshiteru; Shiroka, T.; Wang, C.; Luetkens, H.; Yang, Haoming; Lü, Minfeng; Choi, K.-Y.

doi:10.1103/physrevb.105.094439

Cited by 2 publications

(1 citation statement)

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“…This increase can be explained by slowing down of fluctuations as the magnetic system is approaching the ordered state (see, e.g., ref. 40). Mermin-Wagner theorem proposes that in the case of a 2D magnetic system, the ordered state occurs at zero temperature 8 .…”

Section: Differentiation Between Static and Dynamic Magnetismmentioning

confidence: 99%

Observation of Mermin-Wagner behavior in LaFeO3/SrTiO3 superlattices

Kiaba,

Suter,

Salman

et al. 2024

Nat Commun

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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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Section: Differentiation Between Static and Dynamic Magnetismmentioning

confidence: 99%