{
  "abstract": "In magnetically ordered systems, the spin gap in the magnon spectrum is normally expected to decrease on warming and close at the transition out of the long-range order. The presence of a pseudo-Goldstone gap is commonly associated with nonlinear terms in spin-wave theory. However, its precise origin and detailed properties can vary and remain under debate. Here we show by means of inelastic neutron scattering that the pseudo-Goldstone gap in the Heisenberg helimagnet ZnCr$_2$Se$_4$ exhibits an atypical, nonmonotonic temperature dependence: the gap increases over much of the ordered phase before closing near $T_\\mathrm{N}$. These results align with recent spin-dynamic simulations based on an effective quartic potential in an isotropic system~[Phys. Rev. B \\textbf{113}, L220411 (2026)]. As the pseudo-Goldstone spin gap in ZnCr$_2$Se$_4$ is dominated by quantum effects at subkelvin temperatures, its characteristic growth on warming is caused by thermal fluctuations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.16439",
  "author_total": 11,
  "authors": [
    {
      "name": "N. D. Andriushin"
    },
    {
      "name": "A. Sanders"
    },
    {
      "name": "J. Reuther"
    },
    {
      "name": "D. C. Peets"
    },
    {
      "name": "P. Steffens"
    },
    {
      "name": "A. Hiess"
    },
    {
      "name": "J. Lass"
    },
    {
      "name": "L. Prodan"
    },
    {
      "name": "V. Tsurkan"
    },
    {
      "name": "V. Felea"
    },
    {
      "name": "D. S. Inosov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6yjfd58r2agc3.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.16439",
  "fulltext_url": null,
  "id": "6yjfd58r2agc3",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.16439",
  "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",
      "3104|Advanced Condensed Matter Physics"
    ]
  ],
  "openalex": "W7221827864",
  "pdf_url": "https://arxiv.org/pdf/2610.16439",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6yjfd58r2agc3.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.16439",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.16439"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Thermally Enhanced Pseudo-Goldstone Spin Gap in the Isotropic Helimagnet ZnCr$_2$Se$_4$",
  "title_text": "Thermally Enhanced Pseudo-Goldstone Spin Gap in the Isotropic Helimagnet ZnCr_2Se_4",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/6yjfd58r2agc3",
  "venue": "arXiv",
  "versions": []
}