{
  "abstract": "The valence-bond-glass state of the 4d^1 double perovskite Ba2YMoO6 combines Mo^5+ singlets with residual paramagnetic \"orphan\" spins whose coupling is hard to reach with bulk probes. We probe them by electron paramagnetic resonance of a dilute Gd^3+ ion on the Y^3+ site via broadband coplanar-waveguide transmission at 5 K. The isostructural nonmagnetic niobate Ba2YNbO6, doped with the same Gd^3+ probe, is a fixed-lattice control. The Gd^3+ linewidth nearly doubles in the magnetic host. Dipolar coupling to the sparse orphans is nearly an order of magnitude too weak; the excess is instead reproduced by a transferred f-d superexchange of J ~ 0.2 K, so the width is a static measure of orphan-spin coupling. The half-field (Delta m_S = +/-2) satellite collapses in the magnetic host, a dynamical dephasing channel, while the unchanged g-factor marks a zero-mean random internal field. Together the two channels probe the coupling and dynamics of valence-bond-glass orphan spins.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.18722",
  "author_total": 4,
  "authors": [
    {
      "name": "Patrick Colgan"
    },
    {
      "name": "Artur Solodovnyk"
    },
    {
      "name": "Jeremy P. Carlo"
    },
    {
      "name": "Scott Dietrich"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/26m359b2bywq5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.18722",
  "fulltext_url": null,
  "id": "26m359b2bywq5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.18722",
  "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.dis-nn"
    ],
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "3104|Advanced Condensed Matter Physics"
    ]
  ],
  "openalex": "W7221797930",
  "pdf_url": "https://arxiv.org/pdf/2610.18722",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/26m359b2bywq5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:11Z",
      "native_id": "2610.18722",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.18722"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.dis-nn",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Superexchange coupling between a dilute Gd3+ probe and orphan spins in a valence-bond glass",
  "title_text": "Superexchange coupling between a dilute Gd3+ probe and orphan spins in a valence-bond glass",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:11Z",
  "url": "https://research.draconitic.com/paper/26m359b2bywq5",
  "venue": "arXiv",
  "versions": []
}