{
  "abstract": "The spin structure of the spin density wave (SDW) order in the bilayer nickelate La$_3$Ni$_2$O$_7$ has been investigated using site-selective $^{17}$O-NMR measurements on the inner apical O(1), outer apical O(2), and planar O(3,4) sites. Below $T_{\\rm SDW}$ (= 150 K), the peak of all planar O(3,4) sites significantly broadens due to the emergence of a finite internal magnetic field, whereas O(2) sites remain with no (or a negligibly small) internal field. These results are consistent with commensurate SDW order with a single spin-spinless (or large-tiny spin) stripe. As for the O(1) sites that bridge the NiO$_2$ planes, the internal field is nearly canceled below $T_{\\rm SDW}$, indicating an antiparallel spin configuration between adjacent planes. However, below $T_\\text{A}$ ($\\sim$ 115 K), the spectrum of the O(1) site disappears even though the in-plane SDW order remains robust, implying that the antiparallel spin configuration through the Ni--O(1)--Ni bond is not particularly stable below $T_{\\rm A}$, despite the expected strong interlayer spin coupling between the NiO$_2$ planes. Above all, we emphasize that the local spin susceptibility is extremely small at the O(2) site that has a strong covalency with the $d_{3z^2-r^2}$ orbital, indicating a well-developed interlayer spin-singlet formation in the Ni-$d_{3z^2-r^2}$ orbitals bridging the NiO$_2$ planes. These findings shed new light on the interlayer spin-singlet formation and the anomalous spin reconfiguration through the $\\text{Ni--O(1)--Ni}$ bonding orbitals connecting the NiO$_2$ planes, which characterize the orbital-selective nature of the bilayer nickelate La$_3$Ni$_2$O$_7$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: J. Phys. Soc. Jpn. 95, 104712 (2026)",
  "arxiv": "2608.27917",
  "author_total": 10,
  "authors": [
    {
      "name": "H. Lee"
    },
    {
      "name": "M. Yashima"
    },
    {
      "name": "M. Kakoi"
    },
    {
      "name": "T. Ino"
    },
    {
      "name": "Y. Arai"
    },
    {
      "name": "K. Kitagawa"
    },
    {
      "name": "H. Sakurai"
    },
    {
      "name": "Y. Takano"
    },
    {
      "name": "K. Kuroki"
    },
    {
      "name": "H. Mukuda"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7k2fnk843jwn2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.27917",
  "fulltext_url": null,
  "id": "7k2fnk843jwn2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.27917",
  "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"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.27917",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7k2fnk843jwn2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:52Z",
      "native_id": "2608.27917",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.27917"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Orbital-Selective Coexistence of Interlayer Spin-Singlet Formation and SDW Order with Anomalous Spin Reconfiguration in Bilayer Nickelate La$_{3}$Ni$_{2}$O$_{7}$ Revealed by $^{17}$O-NMR",
  "title_text": "Orbital-Selective Coexistence of Interlayer Spin-Singlet Formation and SDW Order with Anomalous Spin Reconfiguration in Bilayer Nickelate La_3Ni_2O_7 Revealed by ^17O-NMR",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:52Z",
  "url": "https://research.draconitic.com/paper/7k2fnk843jwn2",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.7566/jpsj.95.104712",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}