{
  "abstract": "The magnetic structure of EuRhGe$_3$, a noncentrosymmetric body-centered tetragonal magnet with the space group $I4mm$, has been investigated by resonant X-ray diffraction. Below $T_{\\text{N}}=12$ K, EuRhGe$_3$ undergoes a helical magnetic ordering with an incommensurate propagation vector $q=(0, 0, 0.809)$, in which the magnetic moments lie in the $ab$ plane and rotate by a constant turn angle of $145.8^{\\circ}$ between adjacent layers. When a magnetic field is applied along the $a$ axis at 2 K, a second-harmonic $2q$ peak develops, indicating that the circular helix is gradually distorted into a helimagnetic soliton-lattice state, which eventually undergoes a lock-in transition to the commensurate structure with $q=0.8$ at 3.8 T. Above the subsequent phase boundary at 5 T, the helicity is lost, and a spin-flop $xyz$-fan (elliptic conical) state is realized, in which the moments oscillate predominantly along the $b$ axis but are accompanied by a small $c$-axis component. At higher fields, the system enters a conventional planar $xy$-fan phase without a $c$-axis component. EuRhGe$_3$ provides a prototypical example of a helimagnet that exhibits a full sequence of field-induced structures, evolving from a circular helix to a spin-flop $xyz$-fan (elliptic conical), and finally to a planar $xy$-fan structure, which has been theoretically predicted.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: J. Phys. Soc. Jpn. 95, 104705 (2026)",
  "arxiv": "2608.05709",
  "author_total": 7,
  "authors": [
    {
      "name": "Takeshi Matsumura"
    },
    {
      "name": "Hiroto Nitta"
    },
    {
      "name": "Hironori Nakao"
    },
    {
      "name": "Masashi Kakihana"
    },
    {
      "name": "Masato Hedo"
    },
    {
      "name": "Takao Nakama"
    },
    {
      "name": "Yoshichika Ōnuki"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ewvf9d9tc08pj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.05709",
  "fulltext_url": null,
  "id": "ewvf9d9tc08pj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.05709",
  "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"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.05709",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ewvf9d9tc08pj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2608.05709",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.05709"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Helical-to-Fan Transitions under Magnetic Fields in the Noncentrosymmetric Tetragonal Magnet EuRhGe$_3$",
  "title_text": "Helical-to-Fan Transitions under Magnetic Fields in the Noncentrosymmetric Tetragonal Magnet EuRhGe_3",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/ewvf9d9tc08pj",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.7566/jpsj.95.104705",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}