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Unveiling unconventional magnetism at the surface of Sr2RuO4

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2021

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Fittipaldi, Rosalba
Mercaldo, Maria T.
Komori, Sachio
Bjørlig, Anders
Kyung, W.
Cuoco, Mario
Salman, Zaher
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Nature Communications. Nature Publishing Group. 2021, 12(1), 5792. eISSN 2041-1723. Available under: doi: 10.1038/s41467-021-26020-5

Zusammenfassung

Materials with strongly correlated electrons often exhibit interesting physical properties. An example of these materials is the layered oxide perovskite Sr2RuO4, which has been intensively investigated due to its unusual properties. Whilst the debate on the symmetry of the superconducting state in Sr2RuO4 is still ongoing, a deeper understanding of the Sr2RuO4 normal state appears crucial as this is the background in which electron pairing occurs. Here, by using low-energy muon spin spectroscopy we discover the existence of surface magnetism in Sr2RuO4 in its normal state. We detect static weak dipolar fields yet manifesting at an onset temperature higher than 50 K. We ascribe this unconventional magnetism to orbital loop currents forming at the reconstructed Sr2RuO4 surface. Our observations set a reference for the discovery of the same magnetic phase in other materials and unveil an electronic ordering mechanism that can influence electron pairing with broken time reversal symmetry.

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ISO 690FITTIPALDI, Rosalba, Roman HARTMANN, Maria T. MERCALDO, Sachio KOMORI, Anders BJØRLIG, W. KYUNG, Elke SCHEER, Mario CUOCO, Zaher SALMAN, Angelo DI BERNARDO, 2021. Unveiling unconventional magnetism at the surface of Sr2RuO4. In: Nature Communications. Nature Publishing Group. 2021, 12(1), 5792. eISSN 2041-1723. Available under: doi: 10.1038/s41467-021-26020-5
BibTex
@article{Fittipaldi2021-10-04Unvei-55240,
  year={2021},
  doi={10.1038/s41467-021-26020-5},
  title={Unveiling unconventional magnetism at the surface of Sr<sub>2</sub>RuO<sub>4</sub>},
  number={1},
  volume={12},
  journal={Nature Communications},
  author={Fittipaldi, Rosalba and Hartmann, Roman and Mercaldo, Maria T. and Komori, Sachio and Bjørlig, Anders and Kyung, W. and Scheer, Elke and Cuoco, Mario and Salman, Zaher and Di Bernardo, Angelo},
  note={Article Number: 5792}
}
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