{
  "abstract": "Rare-earth medium-entropy alloys provide a platform for investigating how chemical disorder modifies the well-established pressure-induced structural evolution of close-packed $4f$ lanthanides. Here, we study TbHoEr and TbHoDy using synchrotron X-ray diffraction in diamond anvil cells. Both alloys transform from the ambient hexagonal close-packed (hcp) structure to a double hexagonal close-packed (dhcp) phase, while no well-resolved bulk Sm-type intermediate phase is observed. For TbHoEr, compression to 70 GPa further reveals a high-pressure rhombohedral hR24 phase. Unlike the constituent heavy lanthanides, however, both alloys bypass the intermediate Sm-type phase. Two-dimensional diffraction images further reveal streak-like diffuse scattering in the transition region, indicating stacking disorder and limited stacking coherence along the close-packed direction. These observations indicate that the transformation proceeds through a stacking-disordered close-packed state rather than through a well-ordered bulk Sm-type phase. We propose that configurational disorder, local lattice distortion, stacking-fault energetics, and transformation kinetics collectively suppress the development of long-range Sm-type order. The results demonstrate that medium-entropy alloying can fundamentally modify pressure-induced stacking pathways in rare-earth materials under extreme conditions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: J. Phys.: Condens. Matter 38 (2026) 385401",
  "arxiv": "2608.08351",
  "author_total": 4,
  "authors": [
    {
      "name": "Raimundas Sereika"
    },
    {
      "name": "Matthew P. Clay"
    },
    {
      "name": "Kallol Chakrabarty"
    },
    {
      "name": "Yogesh K. Vohra"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/82b1aj8sn4xda.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.08351",
  "fulltext_url": null,
  "id": "82b1aj8sn4xda",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.08351",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.08351",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/82b1aj8sn4xda.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2608.08351",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.08351"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Pressure-Induced Stacking Disorder and Suppression of Long-Range Sm-type Order in Medium-Entropy Rare-Earth Alloys",
  "title_text": "Pressure-Induced Stacking Disorder and Suppression of Long-Range Sm-type Order in Medium-Entropy Rare-Earth Alloys",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/82b1aj8sn4xda",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1088/1361-648x/aea671",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}