{
  "abstract": "The kagome metal CsV$_3$Sb$_5$ exhibits charge density wave (CDW) and superconducting transitions, both of which are substantially affected by pressure. Recent x-ray diffraction experiments identify a new charge-ordered phase at a pressure coinciding with the dip of the superconducting dome. This CDW phase displays a distinctive wavevector $\\mathbf{Q} = (3/8, 0, 1/2)$ and monoclinic symmetry, in contrast to the $2\\times2\\times 2$ and $2\\times2\\times 4$ orders reported at ambient pressure. In this letter, we show that density functional perturbation theory (DFPT) calculations on a fine reciprocal-space grid predict the leading lattice instability of CsV$_3$Sb$_5$ to be at this wavevector. Finite-displacement calculations reveal that while anharmonic effects stabilize the conventional $L_2^-$ CDW at ambient pressure, the competing $3/8$ instability becomes energetically favorable above $\\sim$1 GPa, consistent with experimental observations. Interestingly, the nesting function displays a peak at the same wavevector. A Landau free energy analysis explains the emergence of the monoclinic distortion observed in x-ray diffraction, in addition to several bond-ordering patterns that may be relevant to the observed trends in the superconducting $T_c$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.38071",
  "author_total": 5,
  "authors": [
    {
      "name": "Luca Buiarelli"
    },
    {
      "name": "Hyeonseo H. Park"
    },
    {
      "name": "Ethan T. Ritz"
    },
    {
      "name": "Rafael M. Fernandes"
    },
    {
      "name": "Turan Birol"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3hz00mc5rjy7m.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.38071",
  "fulltext_url": null,
  "id": "3hz00mc5rjy7m",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.38071",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7214905529",
  "pdf_url": "https://arxiv.org/pdf/2609.38071",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3hz00mc5rjy7m.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.38071",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.38071"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "3/8 charge-density wave instability in the kagome metal CsV$_3$Sb$_5$",
  "title_text": "3/8 charge-density wave instability in the kagome metal CsV_3Sb_5",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/3hz00mc5rjy7m",
  "venue": "arXiv",
  "versions": []
}