{
  "abstract": "Interface-confined superconductivity emerges from the interaction of electronic states across chemically distinct boundaries, providing a route to engineer superconducting phases where magnetism and topology coexist. Determining the intrinsic nature of such superconductivity, however, is challenging because the superconducting layer is only a few nanometers thick and buried beneath several normal layers. Here, we measure the whole-sample Meissner response of six $\\mathrm{FeTe}$-based heterostructures in a uniform magnetic field using a frequency-domain tunnel-diode resonator. In the ultrathin limit, the conventional normalization of the measured susceptibility, $χ(T\\to0)=-1$, fails by tens of percent. We establish the appropriate calibration and invert $χ(T)$ to determine the London penetration depth $λ(T)$. Two key results emerge. First, the broad transitions observed in $χ(T)$ arise naturally from the extreme geometry and large $λ$, without requiring chemical or structural inhomogeneity; the extracted $λ(T)$ closely tracks the resistive transition. Second, $λ(T)$ and the corresponding superfluid density are inconsistent with a fully gapped isotropic $s$-wave state and instead indicate a strongly anisotropic order parameter possibly with line nodes or deep gap minima. The inferred $λ(0)$ is of order $1\\,μ$m, consistent with an independent analysis of the 2D phase stiffness. Despite the distinct chemical, magnetic, and topological character of the three overlayers, all six FeTe heterostructures exhibit similar low-temperature power-law behavior, with no systematic dependence of the superconducting response on overlayer identity. These results point to the interfacial $\\mathrm{FeTe}$ layer as the common origin of superconductivity.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.38148",
  "author_total": 7,
  "authors": [
    {
      "name": "Bicky Singh Moirangthem"
    },
    {
      "name": "Kamal R. Joshi"
    },
    {
      "name": "Zi-Jie Yan"
    },
    {
      "name": "Pu Xiao"
    },
    {
      "name": "Lok-Kan Lai"
    },
    {
      "name": "Cui-Zu Chang"
    },
    {
      "name": "Ruslan Prozorov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/36w6jpbgxcf21.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.38148",
  "fulltext_url": null,
  "id": "36w6jpbgxcf21",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.38148",
  "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.supr-con"
    ],
    [
      "openalex",
      "2504|Iron-based superconductors research"
    ]
  ],
  "openalex": "W7214971584",
  "pdf_url": "https://arxiv.org/pdf/2609.38148",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/36w6jpbgxcf21.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.38148",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.38148"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.supr-con",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Anisotropic interface-confined superconductivity in FeTe-based heterostructures",
  "title_text": "Anisotropic interface-confined superconductivity in FeTe-based heterostructures",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/36w6jpbgxcf21",
  "venue": "arXiv",
  "versions": []
}