{
  "abstract": "Over the past few years, altermagnets have emerged as a new class of collinear magnets with broken time-reversal symmetry, offering novel opportunities for spintronics beyond conventional magnets. Rather than from net magnetization, as in ferromagnets, the unconventional time-reversal symmetry breaking of altermagnets originates from antiferroic magnetic dipoles locked to higher-order multipoles. Here we report the direct visualization of a $g$-wave altermagnetic multipole in the canonical altermagnet CrSb. Combining high-energy synchrotron X-ray diffraction with valence electron density (VED) analysis, we uncover a pronounced directional anisotropy of the VED distribution alternating between Cr sublattices. This evidences the antiferroic order of electric hexadecapoles predicted in $g$-wave altermagnets. Its coexistence with antiferroic magnetic dipoles induces ferroic magnetic multipoles, as probed by polarized neutron diffraction. We further identify a microscopic model of altermagnetism that directly relates the $g$-wave multipole and the $g$-wave spin splitting. Through direct observation and quantification of multipoles, this study provides a real-space fingerprint of altermagnetism and establishes a general probe of hidden multipole order in quantum materials.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.01969",
  "author_total": 19,
  "authors": [
    {
      "name": "Ryo Misawa"
    },
    {
      "name": "Rikuto Oiwa"
    },
    {
      "name": "Shunsuke Kitou"
    },
    {
      "name": "Tatsuya Miki"
    },
    {
      "name": "Motohiko Ezawa"
    },
    {
      "name": "Weiyi Yun"
    },
    {
      "name": "Rinsuke Yamada"
    },
    {
      "name": "Chihaya Koyama"
    },
    {
      "name": "J. Alberto Rodríguez Velamazán"
    },
    {
      "name": "Kamil K. Kolincio"
    },
    {
      "name": "Navid Qureshi"
    },
    {
      "name": "Elina Zhakina"
    },
    {
      "name": "Yuiga Nakamura"
    },
    {
      "name": "Jan Masell"
    },
    {
      "name": "Ilya Belopolski"
    },
    {
      "name": "Taka-hisa Arima"
    },
    {
      "name": "Yusuke Nomura"
    },
    {
      "name": "Satoru Hayami"
    },
    {
      "name": "Max Hirschberger"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1gm4824wmspqf.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.01969",
  "fulltext_url": null,
  "id": "1gm4824wmspqf",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.01969",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "3107|Magnetic properties of thin films"
    ]
  ],
  "openalex": "W7207605431",
  "pdf_url": "https://arxiv.org/pdf/2609.01969",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1gm4824wmspqf.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:16Z",
      "native_id": "2609.01969",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.01969"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Observation of g-wave altermagnetic multipole",
  "title_text": "Observation of g-wave altermagnetic multipole",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:16Z",
  "url": "https://research.draconitic.com/paper/1gm4824wmspqf",
  "venue": "arXiv",
  "versions": []
}