Electron Doping of Cuprates via Interfaces with Manganites

Abstract

The electron doping of undoped high-$T_c$ cuprates via the transfer of charge from manganites (or other oxides) using heterostructure geometries is here theoretically discussed. This possibility is mainly addressed via a detailed analysis of photoemission and diffusion voltage experiments, which locate the Fermi level of manganites above the bottom of the upper Hubbard band of some cuprate parent compounds. A diagram with the relative location of Fermi levels and gaps for several oxides is presented. The procedure discussed here is generic, allowing for the qualitative prediction of the charge flow direction at several oxide interfaces. The addition of electrons to antiferromagnetic Cu oxides may lead to a superconducting state at the interface with minimal quenched disorder. Model calculations using static and dynamical mean-field theory, supplemented by a Poisson equation formalism to address charge redistribution at the interface, support this view. The magnetic state of the manganites could be antiferromagnetic or ferromagnetic. The former is better to induce superconductivity than the latter, since the spin-polarized charge transfer will be detrimental to singlet superconductivity. It is concluded that in spite of the robust Hubbard gaps, the electron doping of undoped cuprates at interfaces appears possible, and its realization may open an exciting area of research in oxide heterostructures.

12 pages, 9 figures

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• Charge transfer in iridate-manganite superlattices
• Anomalous Expansion of the Copper-Apical Oxygen Distance in Superconducting La${}_2$CuO${}_4$ - La${}_{1.55}$Sr${}_{0.45}$CuO${}_4$ Bilayers
• Long-range charge density wave proximity effect at cuprate-manganate interfaces
• Unconventional proximity effect and inverse spin-switch behavior in a model manganite-cuprate-manganite trilayer system
• Magnetic interaction at an interface between manganite and other transition metal oxides
• Competition between covalent bonding and charge transfer at complex-oxide interfaces
• Electronic and Magnetic Properties of ${\mathrm{RMnO}}_3/{\mathrm{AMnO}}_3$ Heterostructures
• Interface reconstruction in superconducting CaCuO2/SrTiO3 superlattices: A hard x-ray photoelectron spectroscopy study
• Single-particle spectral function formulated and calculated by variational Monte Carlo method with application to $d$-wave superconducting state
• Charge transfer in heterostructures of strongly correlated materials
• Visualizing nanoscale electronic band alignment at the La${}_{2/3}$Ca${}_{1/3}$MnO${}_3$/Nb:SrTiO${}_3$ interface
• Aspects of metallic low-temperature transport in Mott-insulator/ band-insulator superlattices: optical conductivity and thermoelectricity
• Mott p-n Junctions in layered materials
• Defect-induced orbital polarization and collapse of orbital order in doped vanadium perovskites
• Interfacial Magnetism in Complex Oxide Heterostructures Probed by Neutrons and X-rays
• Electronic and Magnetic Reconstructions in Manganite Superlattices
• Interfacial Magnetism in Manganite Superlattices
• Large Magnetoresistance in a Manganite Spin-Tunnel-Junction Using LaMnO3 as Insulating Barrier
• Cu_{2}O as nonmagnetic semiconductor for spin transport in crystalline oxide electronics
• High-Tc superconducting dome in artificial heterostructures made of nanoscale quantum building blocks
• Charge localization at the interface between La1-xSrxMnO3 and the infinite layers cuprate CaCuO2
• Surface effects in doping a Mott insulator
• Superconductor to Mott insulator transition in YBa${}_2$Cu${}_3$O${}_7$/LaCaMnO${}_3$ heterostructures
• Brillouin-zone integration scheme for many-body density of states: Tetrahedron method combined with cluster perturbation theory
• Quantitative calculations of charge carrier densities in the depletion layers at YBa2Cu3O7-x interfaces
• Giant magnetoelectric effect in pure manganite-manganite heterostructures
• Gigantic work function in layered AgF2
• Interfacial and thickness effects in La${}_{2/3}$Sr${}_{1/3}$MnO${}_3$/YBa${}_2$Cu${}_3$O${}_7$ superlattices