Electronic correlations and spin-charge-density stripes in double-layer La${}_3$Ni${}_2$O${}_7$

Abstract

Using \emph{ab initio} band structure and DFT+dynamical mean-field theory methods we examine the effects of electron-electron interactions on the electronic structure, magnetic state, and structural phase stability of the recently discovered double-layer perovskite superconductor La${}_3$Ni${}_2$O${}_7$ (LNO) under pressure. Our results show the emergence of a double spin-charge-density stripe state characterized by a wave vector $\mathbf{q}=(\frac{1}{4},\frac{1}{4})$ arrangement of the nominally high-spin Ni${}_{\mathrm{A}}^{2+}$ and low-spin Ni${}_{\mathrm{B}}^{3+}$ ions (diagonal hole stripes oriented at $45^{\circ }$ to the Ni-O bond) which form zigzag ferromagnetic chains alternating in the $ab$ plane. The phase transition is accompanied by cooperative breathing-mode distortions of the lattice structure and leads to a reconstruction of the low-energy electronic structure and magnetic properties of LNO. We obtain a narrow-gap correlated insulator with a band gap value of $\sim$0.2 eV characterized by strong localization of the Ni $3d$ states and significant spin-orbital polarizations of the charge deficient Ni${}_{\mathrm{B}}^{3+}$ ions. Our results suggest the importance of double exchange to determine the magnetic properties of LNO, similarly to that in charge-ordered manganites. We propose that spin and charge stripe fluctuations play an important role to tune superconductivity in LNO under pressure.

9 pages, 5 figures

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Cited by in corpus (1)

• Effect of doping on the electronic structure, orbital-dependent renormalizations, and magnetic correlations in bilayer La${}_3$Ni${}_2$O${}_7$