{
  "id": "2501.17833",
  "version": "v1",
  "published": "2025-01-29T18:29:09.000Z",
  "updated": "2025-01-29T18:29:09.000Z",
  "title": "Thermal properties revisited in displacive ferroelectrics",
  "authors": [
    "G. D. Zhao",
    "F. Yang",
    "L. Q. Chen"
  ],
  "comment": "10 pages, 11 figures",
  "categories": [
    "cond-mat.mtrl-sci"
  ],
  "abstract": "The collective amplitude mode of the order parameter in displacive ferroelectrics, termed the ferron, represents the amplitude fluctuations of long-range ordered polarization. At temperatures well below phase transition temperature $T_c$, the energy of ferron excitation is significantly gapped in the long-wavelength limit. As $T_c$ is approached, this gap softens dramatically to minimal or gapless values, thereby should lead to a substantial contribution to thermal properties. In this context, we explore the role of ferrons in heat capacity and thermal transport by incorporating a microscopic self-consistent phase-transition theory for displacive ferroelectricity in contrast to the conventional treatment of attributing thermal properties solely to acoustic phonons. Using ferroelectric $\\rm{PbTiO}_{3}$ as a case study, we show that the softening of ferrons near the phase transition is essential to accurately capturing the experimental temperature and electric-field dependencies of thermal properties.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2025-01-29T18:29:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "displacive ferroelectrics",
      "microscopic self-consistent phase-transition theory",
      "phase transition temperature",
      "electric-field dependencies",
      "acoustic phonons"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}