{
  "abstract": "We report a temperature-dependent investigation of orthoferrite TbFeO$_3$ using x-ray diffraction, DC magnetization, and Raman scattering, complemented by room-temperature x-ray photoelectron spectroscopy. X-ray diffraction reveals negative thermal expansion over 5-300 K, with a small but systematic increase in unit-cell volume upon cooling in the absence of any structural phase transition. Raman scattering measurements identify the Raman-active phonon modes and show clear deviations from the conventional Klemens anharmonic decay model, particularly in phonon frequencies, indicating the presence of spin-phonon coupling. Two modes of $A_g$ and $B_{1g}$ symmetry exhibit a crossover from Gaussian-dominated line shapes at low temperatures to mixed Gaussian-Lorentzian profiles at higher temperatures, reflecting a transition from inhomogeneous broadening to lifetime-driven dynamics. High-energy Raman spectra reveal two-magnon excitations associated with the Fe sublattice, consistent with linear spin-wave theory, whose spectral weight shows only weak temperature dependence. In addition, a broad Raman mode emerging below $\\sim 175$ K exhibits an order-parameter-like temperature evolution and coincides with the onset of phonon anomalies, while no corresponding strong anomaly is observed in the two-magnon response. Taken together, these results establish TbFeO$_3$ as a system with pronounced interplay among lattice dynamics, spin correlations, and emergent local magnetic-lattice anomalies.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.00469",
  "author_total": 7,
  "authors": [
    {
      "name": "Shubham Farswan"
    },
    {
      "name": "Reshma Kumawat"
    },
    {
      "name": "Dipankar Sarkar"
    },
    {
      "name": "Deeksha Singh"
    },
    {
      "name": "Md. Atif Hasan"
    },
    {
      "name": "Devajyoti Mukherjee"
    },
    {
      "name": "Kaushik Sen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fyvcs38hvnbgb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.00469",
  "fulltext_url": null,
  "id": "fyvcs38hvnbgb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.00469",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2608.00469",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fyvcs38hvnbgb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2608.00469",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.00469"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Negative thermal expansion, lattice dynamics, and complex magnetism in TbFeO$_3$",
  "title_text": "Negative thermal expansion, lattice dynamics, and complex magnetism in TbFeO_3",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/fyvcs38hvnbgb",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/dmqs-y92y",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}