Selective formation of apical oxygen vacancies in La${}_{2-x}$Sr${}_x$CuO${}_4$

Abstract

The superconducting properties of high-\tc\ materials are functions of carriers concentration, which is controlled by the concentration of defects including heterovalent cations, interstitial oxygen ions, and oxygen vacancies. Here we combine low-temperature thermal treatment of La${}_{2-x}$Sr${}_x$CuO${}_4$ epitaxial thin films and confocal Raman spectroscopy to control and investigate oxygen vacancies. We demonstrate that the apical site is the most favorable position to accommodate oxygen vacancies under low-temperature annealing conditions. Additionally we show that in high-quality films of overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$, oxygen vacancies strongly deform the oxygen environment around the copper ions. This observation is consistent with previous defect-chemical studies, and calls for further investigation of the defect induced properties in the overdoped regime of the hole-doped lanthanum cuprates.

arXiv comment5 pages, 3 figures

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Cited by in corpus (12)

• Development of the Soft X-ray AGM-AGS RIXS Beamline at Taiwan Photon Source
• Evolution of plasmon excitations across the phase diagram of the cuprate superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$
• Anisotropic scattering caused by apical oxygen vacancies in thin films of overdoped high-temperature cuprate superconductors
• Angle-resolved photoemission spectroscopy of the low-energy electronic structure of superconducting Pr${}_2$CuO${}_4$ driven by oxygen non-stoichiometry
• All-Optical and Microwave-Free Detection of Meissner Screening using Nitrogen-Vacancy Centers in Diamond
• Effect of realistic out-of-plane dopant potentials on the superfluid density of overdoped cuprates
• Electronic and vibrational signatures of ruthenium vacancies in Sr${}_2$RuO${}_4$ thin films
• BCS $d$-wave behavior in the THz electrodynamic response of electron-doped cuprate superconductors
• Superconducting Dome in ${\mathrm{La}}_{3-x}{\mathrm{Sr}}_x{\mathrm{Ni}}_2{\mathrm{O}}_{7-\delta }$ Thin Films
• Optical conductivity of overdoped cuprates from ab-initio out-of-plane impurity potentials
• Effect of anisotropic impurity scattering in d-wave superconductors
• Magnetotransport in overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$: Effect of anisotropic scattering