Evidence for nodal superconductivity in infinite-layer nickelates
Infinite-layer nickelates present a new family of potential unconventional superconductors. A key open question is the superconducting pairing symmetry. We present low-temperature measurements of the magnetic penetration depth in optimally doped La<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub>, Pr<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub>, Nd<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub>, and Nd<sub>0.7875</sub>Sr<sub>0.2125</sub>NiO<sub>2</sub>. For La- and Pr-nickelates, the superfluid density shows a quadratic temperature dependence, indicating nodal superconductivity in the presence of disorder. Nd-nickelate exhibits complex low-temperature behavior associated with Nd 4<i>f</i> magnetism, which precludes a direct measure of the nodal structure.
Authors
- Bai Yang Wang (ORCID: https://orcid.org/0000-0001-5199-9692)
- Y. Lee (ORCID: https://orcid.org/0000-0002-6572-8874)
- Harold Y. Hwang (ORCID: https://orcid.org/0000-0002-9230-3214)
- Danfeng Li (ORCID: https://orcid.org/0000-0001-6894-6765)
- Motoki Osada (ORCID: https://orcid.org/0000-0002-7947-8730)
- Jennifer Fowlie (ORCID: https://orcid.org/0000-0002-3528-6390)
- Shannon P. Harvey (ORCID: https://orcid.org/0000-0002-7272-3609)
- Kyuho Lee (ORCID: https://orcid.org/0000-0002-0817-0499)
Institutions
- SLAC National Accelerator Laboratory (US)
- Stanford University (US)
Publication Details
- Journal
- Proceedings of the National Academy of Sciences
- Published
- 2025-11-26
- DOI
- https://doi.org/10.1073/pnas.2427243122
- Citations
- 2
- Primary Topic
- Magnetic and transport properties of perovskites and related materials
- Type
- article
- Field-Weighted Citation Impact
- 0.85