A "road-map" of Nickelate superconductivity

Abstract

We comment on the electronic structure of Nickelate system $NdNi{O}_2$ which shows superconductivity on doping. The doped system $N{d}_{0.8}S{r}_{0.2}Ni{O}_2$ shows (most probably unconventional) superconductivity with transition temperatures ranging from $9K$ to $15K$\cite{dang}. The resistivity of the parent compound $NdNi{O}_2$ shows a minimum at around 60K, and an up-turn at lower temperatures. In the current understanding it is thought to be originating from a Kondo like coupling between mobile d-states of the $Nd5d$ bands and un-paired electrons in $Ni3d_{x^2-y^2}-O2p$ hybrid orbitals of $N{i}^{1+}$ and $O^{2-}$ions. In this note we offer alternative possibilities of the observed resistance minimum in $LaNi{O}_2$. We attempt to construct a "road-map" of various possibilities to comprehend the observed behaviour and suggest further experiments to prove or disprove a given explanation. We also compare and contrast Nickelates with Cuprates. Comparison points towards unconventional superconductivity in Nickelates.

arXiv comment8 pages, 3 figures

References in corpus (2)

• Robust $d_{x^2-y^2}$-wave superconductivity of infinite-layer nickelates
• Quantum critical point for stripe order: An organizing principle of cuprate superconductivity

Cited by in corpus (2)

• Electronic structure of rare-earth infinite-layer ReNiO2 (Re=La, Nd)
• Polarity induced electronic and atomic reconstruction at NdNiO2/SrTiO3 interfaces