Observation of Mermin-Wagner behavior in LaFeO$_3$/SrTiO$_3$ superlattices
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866911930309935104 |
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| author | Kiaba, Michal Suter, Andreas Salman, Zaher Prokscha, Thomas Chen, Binbin Koster, Gertjan Dubroka, Adam |
| author_facet | Kiaba, Michal Suter, Andreas Salman, Zaher Prokscha, Thomas Chen, Binbin Koster, Gertjan Dubroka, Adam |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_04293 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of Mermin-Wagner behavior in LaFeO$_3$/SrTiO$_3$ superlattices Kiaba, Michal Suter, Andreas Salman, Zaher Prokscha, Thomas Chen, Binbin Koster, Gertjan Dubroka, Adam Strongly Correlated Electrons Materials Science 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. |
| title | Observation of Mermin-Wagner behavior in LaFeO$_3$/SrTiO$_3$ superlattices |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2405.04293 |