Electrodynamic properties of an artificial heterostructured superconducting cuprate

Abstract

We perform infrared conductivity measurements on a series of CaCuO${}_2$/SrTiO${}_3$ heterostructures made by the insulating cuprate CaCuO${}_2$ (CCO) and the insulating perovkite SrTiO${}_3$ (STO). We estimate the carrier density of various heterostructures, with different level of hole doping from the integral of the optical conductivity and we measure the corresponding degree of correlation by estimating the ratio between the Drude weight and the integral of the infrared spectrum. The analysis demonstrates a large degree of correlation, which increases as the doping is reduced. The experimental results can be reproduced by Dynamical Mean-Field Theory calculations which strongly support the role of correlations in the CCO/STO heterostructures and their similarities with the most common cuprate superconductors. Our results suggest that cuprate superconductors can be looked at as natural superlattices, where the properties of the CuO${}_2$ conducting planes and charge reservoir blocks can be completely disentangled.

arXiv comment5 pages, 5 figures

References in corpus (24)

• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Kramers-Kronig constrained variational analysis of optical spectra
• Electrodynamics of Correlated Electron Materials
• Electronic correlations in the iron pnictides
• Optical Conductivity in Mott-Hubbard Systems
• Constant effective mass across the phase diagram of high-T${}_c$ cuprates
• Solving Dynamical Mean-Field Theory at very low temperature using Lanczos Exact Diagonalization
• Optical conductivity and the correlation strength of high temperature copper-oxide superconductors
• Quasiparticle evolution and pseudogap formation in V2O3: An infrared spectroscopy study
• Charge dynamics of the Co-doped BaFe${}_2$As${}_2$
• Temperature dependence of the optical spectral weight in the cuprates: Role of electron correlations
• Frequency-dependent Thermal Response of the Charge System and Restricted Sum Rules in La(2-x)Sr(x)CuO(4)
• High Tc superconductivity at the interface between the CaCuO2 and SrTiO3 insulating oxides
• High Tc superconductivity in superlattices of insulating oxides
• Electronic correlations in iron-pnictide superconductors and beyond; what can we learn from optics
• The infrared spectrum of Na_0.57CoO_2
• In-plane optical spectral weight transfer in optimally doped Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10}$
• Optical properties of V2O3 in its whole phase diagram
• High-temperature optical spectral weight and Fermi liquid renormalization in Bi-based cuprates
• Optical Properties of (SrMnO3)n/(LaMnO3)2n superlattices: an insulator-to-metal transition observed in the absence of disorder
• Interface reconstruction in superconducting CaCuO2/SrTiO3 superlattices: A hard x-ray photoelectron spectroscopy study
• Optical sum rule anomalies in the cuprates: interplay between strong correlation and electronic bandstructures
• Spectral weight redistribution in (LaNiO3)n/(LaMnO3)2 superlattices from optical spectroscopy
• Raman spectroscopy study of the interface structure in (CaCuO2)n/(SrTiO3)m superlattices

Cited by in corpus (1)

• Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens