Pith Number

pith:UVR2TNII

pith:2026:UVR2TNIIIFXKB26P7XSVEAM2F2

not attested not anchored not stored refs resolved

Observation of flat-bottom U-shaped energy gap in high-Tc nickelate (La,Pr)3Ni2O7 thin films

Haoran Ji, Jian Wang, Tianheng Wei, Wei Ren, Yanzhao Liu, Zhen Liang, Zheyuan Xie, Ziqiang Wang

An energy-symmetric flat-bottom U-shaped gap consistent with nodeless superconductivity is observed in high-Tc nickelate thin films at ambient pressure.

arxiv:2605.15703 v1 · 2026-05-15 · cond-mat.supr-con · cond-mat.mes-hall · cond-mat.mtrl-sci · cond-mat.str-el

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Record completeness

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3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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Claims

C1strongest claim

The energy-symmetric, flat-bottom U-shaped gap with zero residual density of states, taken together with its dependence on magnetic field and temperature, is consistent with the behavior of a superconducting gap, suggesting a nodeless gap function at ultra-low temperatures.

C2weakest assumption

That the tunneling spectra measured by STM/S directly represent the intrinsic bulk superconducting density of states of the film without dominant contributions from surface reconstruction, disorder, or non-superconducting phases. This premise enters when the abstract interprets the U-shaped gap and its field/temperature dependence as evidence for superconductivity.

C3one line summary

Observation of an energy-symmetric flat-bottom U-shaped gap with zero residual DOS in (La,Pr)3Ni2O7 thin films, showing unconventional temperature evolution and magnetic field suppression consistent with a nodeless superconducting gap.

References

61 extracted · 61 resolved · 1 Pith anchors

[1] Sun, H. et al. Signatures of superconductivity near 80 K in a nickelate under high pressure. Nature 621, 493–498 (2023) 2023

[2] Zhang, Y . et al. High-temperature superconductivity with zero resistance and strange-metal behaviour in La3Ni2O7−δ. Nature Physics 20, 1269–1273 (2024) 2024

[3] Wang, N. et al. Bulk high-temperature superconductivity in pressurized tetragonal La2PrNi2O7. Nature 634, 579–584 (2024) 2024

[4] Yang, J. et al. Orbital-dependent electron correlation in double-layer nickelate La3Ni2O7. Nature Communications 15, 4373 (2024) 2024

[5] Luo, Z., Hu, X., Wang, M., Wú, W. & Yao, D.-X. Bilayer Two-Orbital Model of La3Ni2O7 under Pressure. Physical Review Letters 131, 126001 (2023) 2023

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-20T00:01:13.404229Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a563a9b508416ea0ebcffde552019a2ea54559cf4eea3808ea096db0a22f17e0

Aliases

arxiv: 2605.15703 · arxiv_version: 2605.15703v1 · doi: 10.48550/arxiv.2605.15703 · pith_short_12: UVR2TNIIIFXK · pith_short_16: UVR2TNIIIFXKB26P · pith_short_8: UVR2TNII

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/UVR2TNIIIFXKB26P7XSVEAM2F2 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: a563a9b508416ea0ebcffde552019a2ea54559cf4eea3808ea096db0a22f17e0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6a6ec52c53a506ee4c08edaa59368bdea94656fcc6dd4d8509a9fb9a4faab98a",
    "cross_cats_sorted": [
      "cond-mat.mes-hall",
      "cond-mat.mtrl-sci",
      "cond-mat.str-el"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cond-mat.supr-con",
    "submitted_at": "2026-05-15T07:48:59Z",
    "title_canon_sha256": "97cf871f9458306dff7227e62b1ce8d49fabc8bccff98c7d296a9c4d17e3f62b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.15703",
    "kind": "arxiv",
    "version": 1
  }
}