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Evidence for nodal superconductivity in infinite-layer nickelates

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arxiv 2201.12971 v1 pith:54LQRQ67 submitted 2022-01-31 cond-mat.supr-con

Evidence for nodal superconductivity in infinite-layer nickelates

classification cond-mat.supr-con
keywords infinite-layerlow-temperaturenickelatesnodalpairingsuperconductivityattributebehavior
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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  1. Recent progress in nickelate superconductors

    cond-mat.supr-con 2025-09 conditional novelty 2.0

    A comprehensive review of nickelate superconductors that surveys the 112, 327, and 43(10) families and frames the key open questions about their pairing mechanisms.