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Magnetic penetration depth and $T_c$ in superconducting nickelates

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arxiv 1910.13269 v1 pith:XI6Y33PU submitted 2019-10-29 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

F. Bernardini , V. Olevano , A. Cano This is my paper · ORCID
classification cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
keywords depthmagneticpenetrationrelationsuperconductingaccordingattainablecalculations
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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.

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  1. Pressure and strain effects on the $\textit{ab initio}$ $GW$ electronic structure of La$_3$Ni$_2$O$_7$

    cond-mat.supr-con 2025-04 conditional novelty 6.0 of 10

    A one-shot GW calculation predicts that correlations remove the gamma hole pocket of La3Ni2O7 and that the La-5d x2-y2 band approaches the Fermi level under pressure and strain, matching ARPES without a Hubbard U.

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