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DS: Fachverband Dünne Schichten

DS 15: Focus Session: Nickelate Superconductivity: Insights into Unconventional Pairing and Correlation Effects II (joint session TT/DS/MA)

DS 15.6: Talk

Thursday, March 12, 2026, 10:45–11:00, HSZ/0003

Systematically Controlled Disorder to Probe Pairing Symmetry in Infinite-Layer Nickelates — •A. Ranna¹, R. Grasset², M. Gonzalez³, K. Lee³, B. Y. Wang³, D. Zhang⁴, W. Sun⁵, C. Parzyck⁶, Y. Wu⁶, M. Konczykowski², M. Bibes⁴, K. M. Shen⁶, Y. F. Nie⁵, L. Iglesias⁴, H. Y. Hwang³, A. P. Mackenzie¹, and B. H. Goodge¹ — ¹MPI CPfS, Germany — ²LSI, Ecole Polytechnique, France — ³Stanford University, USA — ⁴CNRS Thales, France — ⁵Nanjing University, China — ⁶Cornell University, USA

Superconductivity in infinite-layer nickelates has expanded rapidly with advances in thin-film synthesis and reduction techniques. A central question is the symmetry of the superconducting gap in these materials. Because superconducting samples can only be stabilized as thin films and suffer surface degradation during the post-growth reduction process, some conventional probes to determine the gap symmetry remain challenging to perform and interpret. Here, we leverage high-energy electron irradiation to controllably introduce point-like defects without altering film stoichiometry or crystallinity. Tracking superconductivity with systematically increasing disorder shows a steady suppression of transition temperature and rising normal state resistivity, indicative of an unconventional, sign-changing gap [1] . Additionally, this method offers a unique way to study the effect of point defects on superconducting and electronic properties in nickelates across rare-earth compositions, doping, and strain to disentangle intrinsic behavior from synthesis-related variability.
[1] Ranna et al., PRL 135, 126501 (2025).

Keywords: unconventional superconductivity; infinite-layer nickelates; high-energy electron irradiation; pairing symmetry