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 London penetration depth in optimally doped La_{0.8}Sr_{0.2}NiO_{2}, Pr_{0.8}Sr_{0.2}NiO_{2}, and Nd_{0.8}Sr_{0.2}NiO_{2}. 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, which we attribute to magnetic impurities. These results are consistent with d-wave pairing.
@article{arxiv.2201.12971,
title = {Evidence for nodal superconductivity in infinite-layer nickelates},
author = {Shannon P. Harvey and Bai Yang Wang and Jennifer Fowlie and Motoki Osada and Kyuho Lee and Yonghun Lee and Danfeng Li and Harold Y. Hwang},
journal= {arXiv preprint arXiv:2201.12971},
year = {2022}
}
Comments
5 pages, 4 figures, 1 table, 1 supplementary material