Intrinsic high electrical conductivity of stoichiometricSrNbO3epitaxial thin films

Abstract

), the reported electrical resistivity of SrNbO 3 is much higher than that of SrVO 3 , probably owing to nonstoichiometry. In this paper, we grew epitaxial, high-conductivity stoichiometric SrNbO 3 using pulsed laser deposition. The growth temperature strongly affected the Sr/Nb ratio and the oxygen content of the films, and we obtained stoichiometric SrNbO 3 at a very narrow temperature window around 630 °C. The stoichiometric SrNbO 3 epitaxial thin films grew coherently on KTaO 3 (001) substrates with high crystallinity. The room-temperature resistivity of the stoichiometric film was 2.82 × 10 −5 cm, one order of magnitude lower than the lowest reported value of SrNbO 3 and comparable with that of SrVO 3 . We observed a T-square dependence of resistivity below T* = 180 K and non-Drude behavior in near-infrared absorption spectroscopy, attributable to the Fermi-liquid nature caused by electron correlation. Analysis of the T-square coefficient A of resistivity experimentally revealed that the 4d orbital of Nb that is larger than the 3d ones certainly contributes to the high electrical conduction of SrNbO 3 .

Strain tuning of plasma frequency in vanadate, niobate, and molybdate perovskite oxides

“…This supports the observations of Ref. 71. While the plasma frequency is not suppressed enough to make SrNbO 3 optically transparent, Ruddlesden-Popper Sr 2 NbO 4 is more promising:…”

Electron transport and visible light absorption in a plasmonic photocatalyst based on strontium niobate

“…As both charge carrier density and mobility contribute to the conductivity of a sample, simply assuming a large mobility for a highly conductive material may lead to a wrong conclusion. It has also been reported by Oka et al 27. that the highest conducting SrNbO 3 thin film grown on KTaO 3 substrate can have a high carrier density of 10 22  cm −3 and relatively low mobility of 16 cm 2  V −1  s −1 at room temperature.…”

Electron Sandwich Doubles the Thermoelectric Power Factor of SrTiO3

“…Previously reported data for σ , n , and µ Hall are plotted for comparison (blue circles indicate the SrNbO 3 film from ref. ; green circles are for slightly Nb‐doped SrTiO 3 ). The gray lines are drawn as a guide.…”