Disorder-induced suppression of superconductivity in infinite-layer nickelates

Abhishek Ranna; Romain Grasset; Martin Gonzalez; Kyuho Lee; Bai Yang Wang; Edgar Abarca Morales; Florian Theuss; Zuzanna H. Filipiak; Michal Moravec; Marcin Konczykowski; Harold Y. Hwang; Andrew P. Mackenzie; Berit H. Goodge

doi:10.1103/7lqb-pjkm

Disorder-induced suppression of superconductivity in infinite-layer nickelates

Superconductivity 2025-09-18 v1

Authors: Abhishek Ranna , Romain Grasset , Martin Gonzalez , Kyuho Lee , Bai Yang Wang , Edgar Abarca Morales , Florian Theuss , Zuzanna H. Filipiak , Michal Moravec , Marcin Konczykowski , Harold Y. Hwang , Andrew P. Mackenzie , Berit H. Goodge

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Abstract

The pairing symmetry of superconducting infinite-layer nickelates is a fundamental yet experimentally challenging question. We employ high-energy electron irradiation to induce disorder in superconducting Nd $_{0.825}$ Sr $_{0.175}$ NiO $_2$ thin films and examine the impact of pair-breaking defects on superconductivity and elucidate the nature of the superconducting gap. Our measurements reveal a complete suppression of superconductivity with increasing disorder, suggesting an unconventional, sign-changing order parameter.

Keywords

infinite-layer nickelates superconductivity disorder pair-breaking defects superconducting gap order parameter electron irradiation

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@article{arxiv.2506.09543,
  title  = {Disorder-induced suppression of superconductivity in infinite-layer nickelates},
  author = {Abhishek Ranna and Romain Grasset and Martin Gonzalez and Kyuho Lee and Bai Yang Wang and Edgar Abarca Morales and Florian Theuss and Zuzanna H. Filipiak and Michal Moravec and Marcin Konczykowski and Harold Y. Hwang and Andrew P. Mackenzie and Berit H. Goodge},
  journal= {arXiv preprint arXiv:2506.09543},
  year   = {2025}
}

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Disorder-induced suppression of superconductivity in infinite-layer nickelates

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