{
  "annotation_id": "82fceed9-5a86-4a4c-9874-030b610439e0",
  "date_created": "2026-02-17T05:53:07.567000Z",
  "date_modified": "2026-02-17T05:53:07.567000Z",
  "file_hash": "d2017d979aa18a1a3c5aa336728233ea5aea7c8e8869d4fdce9c2765858c6f0e",
  "private": false,
  "record": {
    "abstract": "Phase transitions are omnipresent in modern condensed matter physics and its applications. In solids, phase transformations typically occur by nucleation and growth under non-equilibrium conditions. Under constant external conditions, $\\textit{e.g.}$, constant heating temperature and pressure, the nucleation and growth dynamics are often thought of as spatially and temporally independent. Here, $\\textit{in-situ}$ Bragg X-ray photon correlation spectroscopy (XPCS) reveals nanoscale spatial and dynamical heterogeneity in the perovskite to brownmillerite topotactic phase transformation in La$_{0.7}$Sr$_{0.3}$CoO$_3$ (LSCO) thin films under constant reducing conditions over a time-span of multiple hours. Specifically, a timescale associated with domain growth remains stable, with a corresponding domain wall speed of $v_d = 6 \\pm 0.5 \\times10^{-4}$ nm/s ($2 \\pm 0.2$ nm/h), while a slower timescale, associated with temperature driven de-pinning of domains, leads to accelerating dynamics with timescales following an aging power law with exponent $-2.2 \\pm 0.5$. The experiment demonstrates that Bragg XPCS is a powerful tool to study nanoscale dynamics in phase transformations. The results are relevant for phase engineering of phase-change devices, as they show that nanoscale dynamics, linked to domain and domain-wall motion, can continuously evolve and speed up with time, even hours after the initiation of the phase transformation, with potential repercussions on electrical performance.",
    "arxiv_id": "2601.06365",
    "authors": [
      "Nicol\u00f2 D\u0027Anna",
      "Erik S. Lamb",
      "Robin Glefke",
      "Daseul Ham",
      "Ishmam Nihal",
      "Su Yong Lee",
      "Yayoi Takamura",
      "Oleg Shpyrko"
    ],
    "categories": [
      "cond-mat.mtrl-sci",
      "cond-mat.mes-hall"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "title": "Dynamic nanoscale spatial heterogeneity in a perovskite to brownmillerite topotactic phase transformation",
    "url": "https://arxiv.org/abs/2601.06365",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "58e8b242-63eb-41da-89a9-2de3e889e4a7",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}