{
  "abstract": "In rare-earth compounds, the interplay between geometric frustration and unusual single-ion anisotropy caused by the crystal electric field often leads to exotic magnetic phases. Here, we investigate the magnetic properties of the rare-earth Shastry-Sutherland compound Er$_2$Be$_2$GeO$_7$ using bulk measurements and neutron scattering down to sub-Kelvin temperatures. A $k=(0,0,0)$ stripe-like antiferromagnetic order with locally tilted Er$^{3+}$ moments is revealed by time-of-flight neutron powder diffraction, accompanied with a $λ$-shape specific-heat anomaly at $T_N=0.84$ K. The temperature dependence of the magnetic peak intensity corresponding to the ordered moment of Er$^{3+}$ approximates to the two-dimensional Ising universality class. Thermal- and cold-neutron inelastic scattering experiments demonstrate that the strong Ising anisotropy originates from the local crystal electric field, and reveal gapped magnetic excitations with weak dispersion in the ordered state. Mean-field random-phase approximation with inequivalent nearest-neighbor couplings accounts well for the collective excitations, while classical Monte Carlo simulations yield the fractional $1/4$ and $1/2$ magnetization plateaus. Our work provides a comprehensive description of the spin correlations in Er$_2$Be$_2$GeO$_7$ with a particular focus on the classical origin of its fractional magnetization plateaus.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.36799",
  "author_total": 18,
  "authors": [
    {
      "name": "Donger Cheng"
    },
    {
      "name": "Otkur Omar"
    },
    {
      "name": "Wenbin Wei"
    },
    {
      "name": "Jan Peter Embs"
    },
    {
      "name": "Xiao Wang"
    },
    {
      "name": "Cheng Su"
    },
    {
      "name": "Hui Cheng"
    },
    {
      "name": "Zhengdong Fu"
    },
    {
      "name": "Xinzhi Liu"
    },
    {
      "name": "Wentao Jin"
    },
    {
      "name": "Ze Hu"
    },
    {
      "name": "Wei Luo"
    },
    {
      "name": "Liming Wang"
    },
    {
      "name": "Jiazheng Hao"
    },
    {
      "name": "Feiran Shen"
    },
    {
      "name": "Lunhua He"
    },
    {
      "name": "Shang Gao"
    },
    {
      "name": "Erxi Feng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0ga3mzdyp1vv8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.36799",
  "fulltext_url": null,
  "id": "0ga3mzdyp1vv8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.36799",
  "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.str-el"
    ],
    [
      "openalex",
      "3104|Advanced Condensed Matter Physics"
    ]
  ],
  "openalex": "W7224088201",
  "pdf_url": "https://arxiv.org/pdf/2610.36799",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0ga3mzdyp1vv8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2610.36799",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.36799"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Stripe antiferromagnetic order and spin dynamics in the Shastry-Sutherland Ising compound Er2Be2GeO7",
  "title_text": "Stripe antiferromagnetic order and spin dynamics in the Shastry-Sutherland Ising compound Er2Be2GeO7",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:50Z",
  "url": "https://research.draconitic.com/paper/0ga3mzdyp1vv8",
  "venue": "arXiv",
  "versions": []
}