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Observation of Mermin-Wagner behavior in LaFeO3/SrTiO3 superlattices

Author

Listed:
  • 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
    Brno University of Technology)

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.

Suggested Citation

  • M. Kiaba & A. Suter & Z. Salman & T. Prokscha & B. Chen & G. Koster & A. Dubroka, 2024. "Observation of Mermin-Wagner behavior in LaFeO3/SrTiO3 superlattices," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49518-0
    DOI: 10.1038/s41467-024-49518-0
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