Infinite-layer nickelate superconductivity in Nd0.8Sr0.2NiO2 is attributed to oxygen pπ hole pairing via correlated hopping, with a predicted large Tc increase under compressive epitaxial strain.
Similarities and differences between infinite-layer nickelates and cuprates and implications for superconductivity
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We have revisited the electronic structure of infinite-layer RNiO$_2$ (R= La, Nd) in light of the recent discovery of superconductivity in Sr-doped NdNiO$_2$. From a comparison to their cuprate counterpart CaCuO$_2$, we derive essential facts related to their electronic structures, in particular the values for various hopping parameters and energy splittings, and the influence of the spacer cation. From this detailed comparison, we comment on expectations in regards to superconductivity. In particular, both materials exhibit a large ratio of longer-range hopping to near-neighbor hopping which should be conducive for superconductivity.
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Hole superconductivity in infinite-layer nickelates
Infinite-layer nickelate superconductivity in Nd0.8Sr0.2NiO2 is attributed to oxygen pπ hole pairing via correlated hopping, with a predicted large Tc increase under compressive epitaxial strain.