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Pairing symmetry in infinite-layer nickelate superconductor
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abstract
The superconducting infinite-layer nickelate family has risen as a promising platform for revealing the mechanism of high-temperature superconductivity. However, its challenging material synthesis has obscured effort in understanding the nature of its ground state and low-lying excitations, which is a prerequisite for identifying the origin of the Cooper pairing in high-temperature superconductors. In particular, the superconducting gap symmetry of nickelates has hardly been investigated and remains controversial. Here, we report the pairing symmetry of the infinite-layer nickelates determined by London penetration depth measurements in neodymium-based (Nd,Sr)NiO$_2$ and lanthanide-based (La,Ca)NiO$_2$ thin films of high crystallinity. A rare-earth-specific order parameter is observed. While the lanthanide nickelates follow dirty line-node behaviour, the neodymium-counterpart exhibits nodeless order parameters such as the $(d+is)$ wave. In contrast to the cuprates, our results suggest that the superconducting order parameter in nickelates is beyond a single $d_(x^2-y^2 )$-wave gap. Furthermore, the superfluid density shows a long tail near the superconducting transition temperature which is consistent with the emergence of a two-dimensional to three-dimensional crossover in the superconducting state. These observations challenge the early theoretical framework and propel further experimental and theoretical interests in the pairing nature of the infinite-layer nickelate family.
Forward citations
Cited by 6 Pith papers
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Marginal-Fermi-Liquid-like Behavior without Pseudogap in Infinite-Layer Nickelates
Infinite-layer nickelates exhibit marginal-Fermi-liquid-like scattering and momentum-dependent spectral-weight suppression without any detectable cuprate-like pseudogap.
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{\it Ab initio} prediction of $d_{x^2-y^2}$-wave superconductivity in infinite-layer nickelates
Fully ab initio SCDFT calculations predict spin-fluctuation-driven dx2-y2(±)-wave two-gap superconductivity in La, Pr, and Nd infinite-layer nickelates, with computed Tc matching experiment.
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Persistent paramagnons in high-temperature infinite-layer nickelate superconductors
In samarium-based infinite-layer nickelates, the measured exchange coupling is about 20% smaller than in praseodymium-based nickelates despite a nearly two-fold higher Tc, opposite to the trend in cuprates.
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Raman response in superconducting multiorbital systems with application to nickelates
Raman response calculations for multiorbital nickelate models produce distinct spectral signatures for different superconducting pairing symmetries.
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Evidence for Clean d-wave Superconductivity in Samarium Nickelates
A laser-pump/terahertz-probe experiment finds a linear temperature dependence of the superfluid density in samarium nickelate films, indicating clean-limit d-wave superconductivity with a gap of 2.5 meV.
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Recent progress in nickelate superconductors
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.
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