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Unveiling unconventional magnetism at the surface of Sr2RuO4

by Suter, A. , Noce, C. , Komori, S. , Yasui, Y. , Di Bernardo, A. , Romano, A. , Salman, Z. , Granata, V. , Fittipaldi, R. , Olde Olthof, L. A. B. , Palomares Garcia, C. M. , Miyoshi, T. , Bjørlig, A. , Kim, C. , Scheer, E. , Robinson, J. W. A. , Higemoto, W. , Kalisky, B. , Kyung, W. , Mercaldo, M. T. , Vecchione, A. , Prokscha, T. , Hartmann, R. , Cuoco, M. , Maeno, Y. , Keren, I.

in 639/301/119/995 / 639/766/119/1003 / 639/766/119/2795 / 639/766/119/997 / Ferromagnetism / Humanities and Social Sciences / Magnetism / multidisciplinary / Muons / Perovskites / Physical properties / Science / Science (multidisciplinary) / Spectroscopy / Spectrum analysis / Strontium / Strontium ruthenium oxide / Superconductivity / Symmetry

2021

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Unveiling unconventional magnetism at the surface of Sr2RuO4

2021

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Unveiling unconventional magnetism at the surface of Sr2RuO4

2021

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Journal Article

Unveiling unconventional magnetism at the surface of Sr2RuO4

Suter, A.,

Noce, C.,

Komori, S.,

Yasui, Y.,

Di Bernardo, A.,

Romano, A.,

Salman, Z.,

Granata, V.,

Fittipaldi, R.,

Olde Olthof, L. A. B.,

Palomares Garcia, C. M.,

Miyoshi, T.,

Bjørlig, A.,

Kim, C.,

Scheer, E.,

Robinson, J. W. A.,

Higemoto, W.,

Kalisky, B.,

Kyung, W.,

Mercaldo, M. T.,

Vecchione, A.,

Prokscha, T.,

Hartmann, R.,

Cuoco, M.,

Maeno, Y.,

Keren, I.

2021

Overview

Materials with strongly correlated electrons often exhibit interesting physical properties. An example of these materials is 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 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 2 RuO 4 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. Strontium Ruthenate, Sr 2 RuO 4 , displays a remarkable number of intriguing physical phenomena, from superconductivity, to strain-induced ferromagnetism. Here, using low-energy muon spectroscopy, Fittipaldi et al. demonstrate the existence of unconventional magnetism at the surface of Sr 2 RuO 4 in its normal state and without any applied strain.

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Publisher

Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio

Subject

/ Humanities and Social Sciences

/ Magnetism