{
  "abstract": "La3Ni2O7, a bilayer nickelate with Ruddlesden-Popper structure, undergoes a pressure-induced structural transition from a tilted Amam phase to an untilted Fmmm (or I4/mmm) phase near 10-15 GPa, concomitant with the emergence of high-Tc superconductivity (Tc ∼ 80 K). Despite intense interest, the phase boundaries and the impact of structural changes on the electronic properties remain unclear. Here, we combine high-pressure and high-temperature Raman and synchrotron-based infrared spectroscopies to map the structural and electronic evolutions. Raman measurements confirm the pressure-driven structural transition and reveal the emergence of Fano line shapes, indicating enhanced electron-phonon coupling. High-temperature data show analogous spectral signatures above 544 K, suggesting an upper temperature limit of the Amam phase within the T-P phase diagram of this system. Infrared reflectivity measurements evidence a concomitant enhanced metallicity, with a tremendous two-order-of-magnitude increase in carrier density, marking a crossover from a weakly to highly metallic state. These results establish a unified picture of the structural transition and its strong coupling to the electronic properties.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Rev. B 114, L140102 (2026)",
  "arxiv": "2605.01651",
  "author_total": 11,
  "authors": [
    {
      "name": "Bastien Michon"
    },
    {
      "name": "Yingpeng Yu"
    },
    {
      "name": "Beatrice d'Alò"
    },
    {
      "name": "Elena Stellino"
    },
    {
      "name": "Gergely Németh"
    },
    {
      "name": "Bosen Wang"
    },
    {
      "name": "Jianping Sun"
    },
    {
      "name": "Jinguang Cheng"
    },
    {
      "name": "Paolo Postorino"
    },
    {
      "name": "Ferenc Borondics"
    },
    {
      "name": "Francesco Capitani"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/23hyqyfyg1c96.bib",
  "cited_by": 1,
  "doi": "10.1103/832c-p7qj",
  "fulltext_url": null,
  "id": "23hyqyfyg1c96",
  "issns": [
    "2469-9950",
    "2469-9969"
  ],
  "landing_url": "https://hal.science/hal-05795506v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.cond"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7203484478",
  "pdf_url": "https://hal.science/hal-05795506/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-01",
  "publisher": "American Physical Society",
  "ris": "https://research.draconitic.com/paper/23hyqyfyg1c96.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:55Z",
      "native_id": "hal-05795506",
      "source": "hal",
      "url": "https://hal.science/hal-05795506v1"
    },
    {
      "first_seen": "2026-10-30T12:18:16Z",
      "native_id": "2605.01651",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.01651"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.supr-con",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Metallic crossover through the tilt-free transition in La 3 Ni 2 O 7 at high pressure and temperature",
  "title_text": "Metallic crossover through the tilt-free transition in La 3 Ni 2 O 7 at high pressure and temperature",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:16Z",
  "url": "https://research.draconitic.com/paper/23hyqyfyg1c96",
  "venue": "Physical Review B",
  "versions": [
    {
      "doi": "10.1103/832c-p7qj",
      "pid": "23hyqyfyg1c96",
      "relation": "published-as",
      "title": "Metallic crossover through the tilt-free transition in La 3 Ni 2 O 7 at high pressure and temperature",
      "venue": "Physical Review B"
    }
  ]
}