Single-particle tunneling spectrum with a robust superconducting gap in La 2 PrNi 2 O 7 thin films at ambient pressure
- 1National Laboratory of Solid State Microstructures and Department of Physics, Jiangsu Physical Science Research Center, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
- 2Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany
- 3Jiangsu Physical Science Research Center, Nanjing, China
Abstract
The recent discovery of high-temperature superconductivity in nickelate systems has generated tremendous interest in the community. The core issue to understand the pairing mechanism is the superconducting gap and its symmetry. We have successfully synthesized the superconducting thin films of La 2 PrNi 2 O 7 with an onset transition temperature of 41.5 kelvins and measured the superconducting tunneling spectra after exposing the superconducting layer by using the tip-excavation technique. The spectrum shows a robust superconducting gap at about Δ ≈ 19 milli–electron volts, and fittings based on the Dynes model indicate that this dominant gap should have an s -wave structure with low anisotropy, which allows us to put the priority in selecting the s ± pairing symmetry. Furthermore, a clear hump structure is observed at an energy of 49 ± 2 milli–electron volts, which is inclined to be interpreted as a bosonic mode. Our results help clarify the mystery of superconductivity in bilayer nickelate superconductors.
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BibTeX
@article{fan2026singleparticle,
title = {{Single-particle tunneling spectrum with a robust superconducting gap in La 2 PrNi 2 O 7 thin films at ambient pressure}},
author = {Shengtai Fan and Mengjun Ou and Marius Scholten and Qing Li and Zhiyuan Shang and Yi Wang and Jie Xu and Huan Yang and Ilya Eremin and Hai-Hu Wen},
journal = {Science Advances},
year = {2026},
month = jun,
doi = {10.1126/sciadv.aeg2429},
url = {https://doi.org/10.1126/sciadv.aeg2429},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - Single-particle tunneling spectrum with a robust superconducting gap in La 2 PrNi 2 O 7 thin films at ambient pressure
AU - Shengtai Fan
AU - Mengjun Ou
AU - Marius Scholten
AU - Qing Li
AU - Zhiyuan Shang
AU - Yi Wang
AU - Jie Xu
AU - Huan Yang
AU - Ilya Eremin
AU - Hai-Hu Wen
PY - 2026
DA - 2026/06/10
JO - Science Advances
DO - 10.1126/sciadv.aeg2429
UR - https://doi.org/10.1126/sciadv.aeg2429
AB - The recent discovery of high-temperature superconductivity in nickelate systems has generated tremendous interest in the community. The core issue to understand the pairing mechanism is the superconducting gap and its symmetry. We have successfully synthesized the superconducting thin films of La 2 PrNi 2 O 7 with an onset transition temperature of 41.5 kelvins and measured the superconducting tunneling spectra after exposing the superconducting layer by using the tip-excavation technique. The spectrum shows a robust superconducting gap at about Δ ≈ 19 milli–electron volts, and fittings based on the Dynes model indicate that this dominant gap should have an s -wave structure with low anisotropy, which allows us to put the priority in selecting the s ± pairing symmetry. Furthermore, a clear hump structure is observed at an energy of 49 ± 2 milli–electron volts, which is inclined to be interpreted as a bosonic mode. Our results help clarify the mystery of superconductivity in bilayer nickelate superconductors.
SN - 2375-2548
ER -