{
  "abstract": "Bond disorder in frustrated pyrochlore antiferromagnets can give rise to fundamentally different quantum ground states depending on the nature of the local magnetic moments. Here, we show that the bond-disordered $J_{\\rm eff}=\\frac{1}{2}$ pyrochlore antiferromagnet NaCdCo$_2$F$_7$ realizes an unconventional spin-glass-like state with continued dynamics, in stark contrast to its isostructural $S=\\frac{1}{2}$ NaCdCu$_2$F$_7$ counterpart. High-field magnetization and Co $L_{2,3}$-edge XAS/XMCD establish spin-orbit-entangled $J_{\\rm eff}=\\frac{1}{2}$ Co$^{2+}$ moments with a substantial unquenched orbital contribution, consistent with local $XY$ anisotropy seen in the isostructural Na$A''$Co$_2$F$_7$ ($A''$ = Ca, Sr) analogues. $μ$SR and $^{23}$Na NMR measurements reveal progressive slowing of spin fluctuations below $\\sim10$ K, culminating in a partially frozen state with persistent low-temperature dynamics that deviates from a canonical spin glass. Comparison with the isostructural bond-disordered pyrochlore NaCdCu$_2$F$_7$, which realizes a random-singlet state, reveals a fundamentally different response of spin-orbit-entangled Co$^{2+}$ moments to bond disorder. These results identify spin-orbit coupling as a key ingredient governing the fate of bond-disordered frustrated pyrochlore magnets.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.16875",
  "author_total": 9,
  "authors": [
    {
      "name": "Andrej Kancko"
    },
    {
      "name": "Hironori Sakai"
    },
    {
      "name": "Javier Herrero-Martín"
    },
    {
      "name": "Adam Berlie"
    },
    {
      "name": "Marc Uhlarz"
    },
    {
      "name": "Tetiana Haidamak"
    },
    {
      "name": "Milan Klicpera"
    },
    {
      "name": "Yo Tokunaga"
    },
    {
      "name": "Ross H. Colman"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1cf3ztz4fz9hq.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.16875",
  "fulltext_url": null,
  "id": "1cf3ztz4fz9hq",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.16875",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.other"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2606.16875",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1cf3ztz4fz9hq.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:26Z",
      "native_id": "2606.16875",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.16875"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.other",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Spin-orbit-entangled $J_{\\rm eff}=\\frac{1}{2}$ magnetism and unconventional spin freezing in the bond-disordered pyrochlore antiferromagnet NaCdCo$_2$F$_7$",
  "title_text": "Spin-orbit-entangled J_eff=1/2 magnetism and unconventional spin freezing in the bond-disordered pyrochlore antiferromagnet NaCdCo_2F_7",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:26Z",
  "url": "https://research.draconitic.com/paper/1cf3ztz4fz9hq",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/7tlr-cmqq",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}