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Unveiling unconventional magnetism at the surface of Sr$$_2$$RuO$$_4$$

Fittipaldi, R.*; Hartmann, R.*; Mercaldo, M. T.*; Komori, Sachio*; Bj${o}$rlig, A.*; Higemoto, Wataru  ; Maeno, Yoshiteru*; Di Bernardo, A.*; 18 of others*

The layered oxide perovskite Sr$$_2$$RuO$$_4$$, which has been intensively investigated due to its unusual properties. Whilst the debate on the symmetry of the superconducting state in Sr$$_2$$RuO$$_4$$ is still ongoing, a deeper understanding of the Sr$$_2$$RuO$$_4$$ 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$$_2$$RuO$$_4$$ at an onset temperature higher than 50 K. Our observations set a reference for the discovery of the same magnetic phase in other materials.

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Category:Multidisciplinary Sciences

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