Dresden 2026 – scientific programme
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DS: Fachverband Dünne Schichten
DS 10: Focus Session: Nickelate Superconductivity: Insights into Unconventional Pairing and Correlation Effects I (joint session TT/DS/MA)
DS 10.5: Topical Talk
Wednesday, March 11, 2026, 11:45–12:15, HSZ/0003
Superconducting gap structure and bosonic mode in La2PrNi2O7 thin films at ambient pressure — •Hai-Hu Wen — Hankou Rd. 22, Gulou, Nanjing, China
The recent discovery of high temperature superconductivity in nickelate systems has generated tremendous interests in the community. The core issue to understand the pairing mechanism is about the superconducting gap and its symmetry. We have successfully synthesized the superconducting thin films of La2PrNi2O7 with Tc onset = 41.5 K, and measured the superconducting tunneling spectra after we expose the superconducting layer by using the tip-excavation technique. The spectrum shows a two-gap structure with Δ1 = 9 meV, Δ2 = 6-8 meV, and fittings based on the Dynes model indicate that the dominant gap should have an s-wave structure with low anisotropy, this allows us to select the s+−-pairing symmetry among the two possibilities s+− and d-wave. Furthermore, a clear bosonic mode with energy Ω = 30 ± 2 meV is observed, which further supports a sign reversal gap[1]. Our results shed new light in understanding the mystery of superconductivity in bilayer nickelate superconductors.
Collaborators: Huan Yang, Ilya M. Eremin, Shengtai Fan, Mengjun Ou, Marius Scholten, Qing Li, Zhiyuan Shang, Yi Wang, Jiasen Xu
[1] S. Fan et al., arXiv: 2506.01788
Keywords: nickelate superconductor; gap structure; Bosonic mode