{
  "abstract": "We investigate the influence of Co intercalation and altermagnetic order on the lattice dynamics of the layered compound Co$_{1/4}$NbSe$_2$. Polarization-resolved Raman spectroscopy, supported by density-functional theory, enables identification of six Raman-active phonons. Co intercalation drives a substantial reconstruction of the vibrational spectrum through zone folding of NbSe$_2$ phonons, producing hybridized modes with mixed zone-center and zone-boundary character. Despite this, Co atoms do not participate in any Raman-active modes by symmetry, which is in marked contrast to related $1/3$ compounds where intercalant modes do contribute to the Raman spectrum. Temperature-dependent Raman measurements across the altermagnetic transition show no discontinuities, which is consistent with magnetic fluctuations persisting above the Néel temperature. However, we find evidence for spin-phonon coupling in $A_{1g}$ symmetry modes owing to their out-of-plane Se displacements. Our work demonstrates the substantial impact of intercalation on the vibrational properties of transition metal dichalcogenides and the presence of spin-phonon interactions in a newly discovered altermagnetic material.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.05616",
  "author_total": 6,
  "authors": [
    {
      "name": "Dushyanthini Balasundaram"
    },
    {
      "name": "Bishal Thapa"
    },
    {
      "name": "Resham Babu Regmi"
    },
    {
      "name": "Nirmal J. Ghimire"
    },
    {
      "name": "Igor I. Mazin"
    },
    {
      "name": "Patrick M. Vora"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4tc6m448nxjqs.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.05616",
  "fulltext_url": null,
  "id": "4tc6m448nxjqs",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.05616",
  "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.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "2505|2D Materials and Applications"
    ]
  ],
  "openalex": "W7167736211",
  "pdf_url": "https://arxiv.org/pdf/2607.05616",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4tc6m448nxjqs.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:03Z",
      "native_id": "2607.05616",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.05616"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Raman spectroscopy of the van der Waals altermagnet Co$_{1/4}$NbSe$_2$",
  "title_text": "Raman spectroscopy of the van der Waals altermagnet Co_1/4NbSe_2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:03Z",
  "url": "https://research.draconitic.com/paper/4tc6m448nxjqs",
  "venue": "arXiv",
  "versions": []
}