{
  "abstract": "The magnetic behavior of Ca$_2$RuO$_4$ represents a unique puzzle due to the interplay of strong electronic correlations, magneto-elastic interactions, and large spin-orbit coupling. At low temperatures, an anomalous Mott insulating state emerges, characterized by a complex antiferromagnetic order with a collective amplitude excitation of the magnetic moment which has been discussed in analogy with the Higgs mode. We report here evidence of a magnetic first-order phase transition driven by an out-of-plane magnetic field along the crystallographic $c$-axis of Ca$_2$RuO$_4$. Raman measurements in magnetic field reveal the emergence of mode of magnetic origin and a concomitant modification of the coupling between a phonon and the Higgs amplitude mode. Both the Raman features are characterized by a non-reciprocal hysteresis in magnetic field. Surprisingly, the observed phase transition does not affect the Raman scattering from the in-plane magnons, indicating that the dipolar antiferromagnetic order is preserved. This is consistent with the onset of a new quadrupolar field-controlled state, whose fluctuations structure can trigger an hybridization between the lattice and the magnetic Higgs mode resulting in the observed Raman features.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.07565",
  "author_total": 20,
  "authors": [
    {
      "name": "Giacomo Jarc"
    },
    {
      "name": "Giovanni Tartaglia"
    },
    {
      "name": "Francesco Gabriele"
    },
    {
      "name": "Filomena Forte"
    },
    {
      "name": "Anita Guarino"
    },
    {
      "name": "Angela Montanaro"
    },
    {
      "name": "Enrico Maria Rigoni"
    },
    {
      "name": "Nitesh Khatiwada"
    },
    {
      "name": "Costanza Lincetto"
    },
    {
      "name": "Gabriele Bartolini"
    },
    {
      "name": "Antonio Mastropasqua"
    },
    {
      "name": "Shahla Yasmin Mathengattil"
    },
    {
      "name": "Marco Malvestuto"
    },
    {
      "name": "Muhammad Waqee Ur Rehman"
    },
    {
      "name": "Rosalba Fittipaldi"
    },
    {
      "name": "Joachim Deisenhofer"
    },
    {
      "name": "Alexander A. Tsirlin"
    },
    {
      "name": "Antonio Vecchione"
    },
    {
      "name": "Mario Cuoco"
    },
    {
      "name": "Daniele Fausti"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dve2sq6n9ny3q.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.07565",
  "fulltext_url": null,
  "id": "dve2sq6n9ny3q",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.07565",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "2504|Magnetic and transport properties of perovskites and related materials"
    ]
  ],
  "openalex": "W7212029269",
  "pdf_url": "https://arxiv.org/pdf/2609.07565",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dve2sq6n9ny3q.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:48Z",
      "native_id": "2609.07565",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.07565"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Raman signatures of a non-reciprocal magnetic phase transition in Ca$_2$RuO$_4$",
  "title_text": "Raman signatures of a non-reciprocal magnetic phase transition in Ca_2RuO_4",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:48Z",
  "url": "https://research.draconitic.com/paper/dve2sq6n9ny3q",
  "venue": "arXiv",
  "versions": []
}