{
  "annotation_id": "63c12afa-2fc5-4c74-ac61-a5c723939d01",
  "date_created": "2026-02-17T05:53:15.940000Z",
  "date_modified": "2026-02-17T05:53:15.940000Z",
  "file_hash": "0440179a3bffd5306d091ec2a41c3734bcaf46d327a0a246e8054ebc830f6fe5",
  "private": false,
  "record": {
    "abstract": "Field-angle-resolved specific-heat measurements were performed on a clean single crystal of a spin-triplet superconductor UTe$_2$ with $T_{\\rm c}=2.1$ K and a low residual electronic specific heat. At low temperatures, the specific heat exhibits a linear dependence on the magnetic field when the field is applied precisely along the $b$ axis, in stark contrast to its rapid increase at low fields for other orientations. This pronounced anisotropy suggests the presence of nodal quasiparticle excitations with the Fermi velocity predominantly aligned along the $b$ axis. Considering the characteristic field-angle dependences of both the specific heat and the upper critical field, these observations are broadly compatible with theoretical models that assume a superconducting gap structure featuring either point nodes consistent with $B_{\\rm 2u}$ symmetry, allowed in the infinitely strong spin-orbit coupling scheme, or line nodes confined to flat regions of the quasi-two-dimensional Fermi surface, consistent with $^3B_{\\rm 3u}$ symmetry in the finite spin-orbit classification scheme. These results yield crucial hints for resolving the pairing symmetry of UTe$_2$, paving the way for a deeper understanding of its spin-triplet superconductivity.",
    "arxiv_id": "2601.08201",
    "authors": [
      "Kaito Totsuka",
      "Yohei Kono",
      "Yusei Shimizu",
      "Ai Nakamura",
      "Atsushi Miyake",
      "Dai Aoki",
      "Yasumasa Tsutsumi",
      "Kazushige Machida",
      "Shunichiro Kittaka"
    ],
    "categories": [
      "cond-mat.supr-con",
      "cond-mat.str-el"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "title": "Nodal Superconductivity of UTe$_2$ Probed by Field-Angle-Resolved Specific Heat on a Crystal with $T_{\\rm c}=2.1$ K",
    "url": "https://arxiv.org/abs/2601.08201",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b5b4acbc-6b91-42e4-8444-f9f2e01655dc",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}