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Unveiling unconventional magnetism at the surface of Sr<sub>2</sub>RuO<sub>4</sub>

Unveiling unconventional magnetism at the surface of Sr2RuO4

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FITTIPALDI, 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. 12(1), 5792. eISSN 2041-1723. Available under: doi: 10.1038/s41467-021-26020-5

@article{Fittipaldi2021-10-04Unvei-55240, title={Unveiling unconventional magnetism at the surface of Sr2RuO4}, year={2021}, doi={10.1038/s41467-021-26020-5}, 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} }

Salman, Zaher Kyung, W. Di Bernardo, Angelo Mercaldo, Maria T. Bjørlig, Anders Scheer, Elke Fittipaldi, Rosalba Cuoco, Mario Fittipaldi, Rosalba Mercaldo, Maria T. Komori, Sachio Hartmann, Roman Cuoco, Mario 2021-10-04 2021-10-13T12:56:33Z eng 2021-10-13T12:56:33Z Scheer, Elke Unveiling unconventional magnetism at the surface of Sr<sub>2</sub>RuO<sub>4</sub> Attribution 4.0 International Kyung, W. Komori, Sachio Hartmann, Roman Bjørlig, Anders Salman, Zaher Di Bernardo, Angelo Materials with strongly correlated electrons often exhibit interesting physical properties. An example of these materials is the layered oxide perovskite Sr<sub>2</sub>RuO<sub>4</sub>, which has been intensively investigated due to its unusual properties. Whilst the debate on the symmetry of the superconducting state in Sr<sub>2</sub>RuO<sub>4</sub> is still ongoing, a deeper understanding of the Sr<sub>2</sub>RuO<sub>4</sub> 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 Sr<sub>2</sub>RuO<sub>4</sub> 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 Sr<sub>2</sub>RuO<sub>4</sub> 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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