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Unveiling unconventional magnetism at the surface of Sr2RuO4

Author

Listed:
  • R. Fittipaldi

    (CNR-SPIN, c/o University of Salerno
    University of Salerno)

  • R. Hartmann

    (University of Konstanz)

  • M. T. Mercaldo

    (University of Salerno)

  • S. Komori

    (University of Cambridge
    Nagoya University)

  • A. Bjørlig

    (Bar Ilan University)

  • W. Kyung

    (Seoul National University)

  • Y. Yasui

    (Kyoto University
    Centre for Emergent Matter Science)

  • T. Miyoshi

    (Kyoto University)

  • L. A. B. Olde Olthof

    (University of Cambridge)

  • C. M. Palomares Garcia

    (University of Cambridge)

  • V. Granata

    (University of Salerno)

  • I. Keren

    (Paul Scherrer Institute
    The Hebrew University of Jerusalem)

  • W. Higemoto

    (Japan Atomic Energy Agency)

  • A. Suter

    (Paul Scherrer Institute)

  • T. Prokscha

    (Paul Scherrer Institute)

  • A. Romano

    (CNR-SPIN, c/o University of Salerno
    University of Salerno)

  • C. Noce

    (CNR-SPIN, c/o University of Salerno
    University of Salerno)

  • C. Kim

    (Seoul National University)

  • Y. Maeno

    (Kyoto University)

  • E. Scheer

    (University of Konstanz)

  • B. Kalisky

    (Bar Ilan University)

  • J. W. A. Robinson

    (University of Cambridge)

  • M. Cuoco

    (CNR-SPIN, c/o University of Salerno
    University of Salerno)

  • Z. Salman

    (Paul Scherrer Institute)

  • A. Vecchione

    (CNR-SPIN, c/o University of Salerno
    University of Salerno)

  • A. Di Bernardo

    (University of Konstanz)

Abstract

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.

Suggested Citation

  • R. Fittipaldi & R. Hartmann & M. T. Mercaldo & S. Komori & A. Bjørlig & W. Kyung & Y. Yasui & T. Miyoshi & L. A. B. Olde Olthof & C. M. Palomares Garcia & V. Granata & I. Keren & W. Higemoto & A. Sute, 2021. "Unveiling unconventional magnetism at the surface of Sr2RuO4," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26020-5
    DOI: 10.1038/s41467-021-26020-5
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    Cited by:

    1. J. N. Graham & C. Mielke III & D. Das & T. Morresi & V. Sazgari & A. Suter & T. Prokscha & H. Deng & R. Khasanov & S. D. Wilson & A. C. Salinas & M. M. Martins & Y. Zhong & K. Okazaki & Z. Wang & M. Z, 2024. "Depth-dependent study of time-reversal symmetry-breaking in the kagome superconductor AV3Sb5," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Yudi Zhang & Kathryn E. Arpino & Qun Yang & Naoki Kikugawa & Dmitry A. Sokolov & Clifford W. Hicks & Jian Liu & Claudia Felser & Guowei Li, 2022. "Observation of a robust and active catalyst for hydrogen evolution under high current densities," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    3. Z. Guguchia & C. Mielke & D. Das & R. Gupta & J.-X. Yin & H. Liu & Q. Yin & M. H. Christensen & Z. Tu & C. Gong & N. Shumiya & Md Shafayat Hossain & Ts. Gamsakhurdashvili & M. Elender & Pengcheng Dai , 2023. "Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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