Abstract
We compute the nominal magnetic penetration depth of $R$NiO$_2$ ($R =$ La, Nd) from first principles calculations and discuss the results in relation to the superconducting $T_c$. We find a marked discrepancy with the well established phenomenology that correlates these two quantities in cuprates (Uemura plot). We also consider the 2D ultrathin limit and estimate the maximum attainable $T_c$ to be $\sim 180$ K according to the Nelson-Kosterliz universal relation between the superfluid density and the transition temperature.
Highlights
The recent discovery of superconductivity in Sr-doped NdNiO2/SrTiO3 thin films [1] has attracted an instantaneous research attention
We find a marked discrepancy with the wellestablished phenomenology that correlates these two quantities in cuprates (Uemura plot)
We consider the two-dimensional ultrathin limit and estimate the maximum attainable Tc to be ∼180 K according to the Nelson-Kosterliz universal relation between the superfluid density and the transition temperature
Summary
The recent discovery of superconductivity in Sr-doped NdNiO2/SrTiO3 thin films [1] has attracted an instantaneous research attention (see, e.g., [2,3,4,5,6,7,8,9,10,11,12,13]) After many attempts, this can potentially be the first successful extension of high-Tc cuprate superconductivity to isostructural/isoelectronic nickelates. First-principles calculations based on density-functional theory (DFT) consistently find that, among the five Ni3d bands, only the 3dx2−y2 states intercept the Fermi level [2,3,4,5,6,14] This establishes a promising analogy to CaCuO2, i.e., the parent compound of high-Tc cuprates.
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