{
  "abstract": "The lower-symmetry $Am2m$ structure was recently proposed as the intrinsic ambient-pressure phase of La$_3$Ni$_2$O$_7$ based on synchrotron x-ray diffraction, whereas earlier studies investigated its properties assuming the commonly accepted $Amam$ structure. Here, we reexamine the crystal structure in La$_3$Ni$_2$O$_7$ and the spin configuration of spin-density-wave (SDW) state via $^{139}$La nuclear quadrupole resonance (NQR). The observation of two distinct La(2) sites in the NQR spectra is naturally accounted for by the $Am2m$ structure without any special assumptions, whereas it cannot be reconciled within the $Amam$ framework. Within the $Am2m$ framework, we reanalyze the spin configuration of the SDW phase and identify it as a large-tiny spin-stripe structure, arising naturally from two inequivalent Ni sites with large and tiny magnetic moments. These results establish the itinerant nature of the SDW order at ambient pressure in La$_3$Ni$_2$O$_7$, providing a basis for understanding its relationship to the emergence of high-$T_c$ superconductivity under high pressure.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.20446",
  "author_total": 8,
  "authors": [
    {
      "name": "Mitsuharu Yashima"
    },
    {
      "name": "Hongnam Lee"
    },
    {
      "name": "Takumi Ino"
    },
    {
      "name": "Nina Seto"
    },
    {
      "name": "Masataka Kakoi"
    },
    {
      "name": "Hiroya Sakurai"
    },
    {
      "name": "Yoshihiko Takano"
    },
    {
      "name": "Hidekazu Mukuda"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fm3125drvcs05.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.20446",
  "fulltext_url": null,
  "id": "fm3125drvcs05",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.20446",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7222026416",
  "pdf_url": "https://arxiv.org/pdf/2610.20446",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fm3125drvcs05.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2610.20446",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.20446"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Large-Tiny Spin-Stripe SDW Order in La$_3$Ni$_2$O$_7$ via $^{139}$La-NQR Spectroscopy: Reconsideration Based on the $Am2m$ Structure",
  "title_text": "Large-Tiny Spin-Stripe SDW Order in La_3Ni_2O_7 via ^139La-NQR Spectroscopy: Reconsideration Based on the Am2m Structure",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:56Z",
  "url": "https://research.draconitic.com/paper/fm3125drvcs05",
  "venue": "arXiv",
  "versions": []
}