Distinct oxygen hole doping in different layers of $\mathrm{S}{\mathrm{r}}_2\mathrm{Cu}{\mathrm{O}}_{4-\delta }-\mathrm{L}{\mathrm{a}}_2\mathrm{Cu}{\mathrm{O}}_4$ superlattices

Abstract

X-ray absorption in $\mathrm{S}{\mathrm{r}}_2\mathrm{Cu}{\mathrm{O}}_{4-\delta }-\mathrm{L}{\mathrm{a}}_2\mathrm{Cu}{\mathrm{O}}_4$ (SCO-LCO) superlattices shows a variable occupation with doping of a hole state different from holes doped for $x\lesssim x_{optimal}$ in bulk $\mathrm{L}{\mathrm{a}}_{2-\mathrm{x}}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4$ and suggests that this hole state is on apical oxygen atoms and polarized in the $a-b$ plane. Considering the surface reflectivity gives a good qualitative description of the line shapes of resonant soft X-ray scattering. The interference between superlattice and surface reflections was used to distinguish between scatterers in the SCO and the LCO layers, with the two hole states maximized in different layers of the superlattice.

References in corpus (5)

• Electronic reconstruction at SrMnO3-LaMnO3 superlattice interfaces
• Superconducting transition at 38 K in insulating-overdoped La2CuO4-La1.64Sr0.36CuO4 superlattices: Evidence for interface electronic redistribution from resonant soft x-ray scattering
• Measurement of x-ray absorption spectra of overdoped high-temperature cuprate superconductors: Inapplicability of the single-band Hubbard model
• Resonant elastic soft x-ray scattering in oxygen-ordered YBa_2Cu_3O_{6+delta}
• Graded Orbital Occupation near Interfaces in a La2NiO4 - La2CuO4 Superlattice

Cited by in corpus (2)

• Different doping from apical and planar oxygen vacancies in Ba${}_2$CuO${}_{4-\delta }$ and La${}_2$CuO${}_{4-\delta }$
• Interface Ferromagnetism in a SrMnO3/LaMnO3 Superlattice