{
  "abstract": "The superconducting diode effect (SDE) is characterized by unequal critical current magnitudes for opposite-polarity current flow, owing to broken spatial-inversion and time-reversal symmetries. For a superconducting pair wavefunction to spontaneously break inversion symmetry implies the formation of Cooper pairs with nonzero momentum, yielding a nonuniform superconducting state. For singlet superconductors, the formation of such a (FFLO) state has long been understood to provide an escape from high field Pauli pair-breaking -- how and why such an effect might occur for equal spin pairing is an open question. Here we report the observation of a large SDE in bulk specimens of the three-dimensional heavy-fermion triplet superconductor UTe$_2$, with a peak diode efficiency of 33% at the high magnetic field strength of 33.6 T, representing the highest-field observation of the SDE to date. Crucially, this nonreciprocal transport is strictly confined to a narrow field regime where superconductivity coexists with a field-induced spin-polarized state near a first-order metamagnetic phase boundary. The absence of the SDE away from this slender phase-intersection argues strongly against purely extrinsic vortex pinning asymmetries. Instead, our findings indicate spontaneous inversion symmetry breaking accompanied by finite-momentum Cooper pairing. We model this behavior using a phenomenological Ginzburg-Landau theory, demonstrating that the intertwining of magnetic and triplet superconducting orders can stabilize an odd-parity FFLO state.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.36332",
  "author_total": 15,
  "authors": [
    {
      "name": "Zheyu Wu"
    },
    {
      "name": "Daniel Shaffer"
    },
    {
      "name": "Dmitry V. Chichinadze"
    },
    {
      "name": "Mengmeng Long"
    },
    {
      "name": "Hanyi Chen"
    },
    {
      "name": "Andrej Cabala"
    },
    {
      "name": "Theodore I. Weinberger"
    },
    {
      "name": "Maurice Bal"
    },
    {
      "name": "Steffen Wiedmann"
    },
    {
      "name": "Dave Graf"
    },
    {
      "name": "Vladimir Sechovský"
    },
    {
      "name": "Michal Vališka"
    },
    {
      "name": "F. Malte Grosche"
    },
    {
      "name": "Alex Levchenko"
    },
    {
      "name": "Alexander G. Eaton"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dpqacd2j7yw3e.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.36332",
  "fulltext_url": null,
  "id": "dpqacd2j7yw3e",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.36332",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "openalex",
      "3104|Rare-earth and actinide compounds"
    ]
  ],
  "openalex": "W7224087114",
  "pdf_url": "https://arxiv.org/pdf/2610.36332",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dpqacd2j7yw3e.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2610.36332",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.36332"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Large superconducting diode effect indicates nonuniform triplet pairing in UTe2",
  "title_text": "Large superconducting diode effect indicates nonuniform triplet pairing in UTe2",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:17Z",
  "url": "https://research.draconitic.com/paper/dpqacd2j7yw3e",
  "venue": "arXiv",
  "versions": []
}