Electronic structure of SrTi${}_{1-x}$V${}_x$O${}_3$ films studied by $insitu$ photoemission spectroscopy: Screening for a transparent electrode material

Abstract

This study investigated the electronic structure of SrTi${}_{1-x}$V${}_x$O${}_3$ (STVO) thin films, which are solid solutions of strongly correlated transparent conductive oxide (TCO) SrVO${}_3$ and oxide semiconductor SrTiO${}_3$, using $insitu$ photoemission spectroscopy. STVO is one of the most promising candidates for correlated-metal TCO because it has the capability of optimizing the performance of transparent electrodes by varying $x$. Systematic and significant spectral changes were found near the Fermi level ($E_{\mathrm{F}}$) as a function of $x$, while the overall electronic structure of STVO is in good agreement with the prediction of band structure calculations. As $x$ decreases from 1.0, spectral weight transfer occurs from the coherent band near $E_{\mathrm{F}}$ to the incoherent states (lower Hubbard band) around 1.0-1.5 eV. Simultaneously, a pseudogap is formed at $E_{\mathrm{F}}$, indicating a significant reduction in quasiparticle spectral weight within close vicinity of $E_{\mathrm{F}}$. This pseudogap seems to evolve into an energy gap at $x$ = 0.4, suggesting the occurrence of a composition-driven metal-insulator transition. From angle-resolved photoemission spectroscopic results, the carrier concentration $n$ changes proportionally as a function of $x$ in the metallic range of $x$ = 0.6-1.0. In contrast, the mass enhancement factor, which is proportional to the effective mass ($m^{\ast }$), does not change significantly with varying $x$. These results suggest that the key factor of $n/m^{\ast }$ in optimizing the performance of correlated-metal TCO is tuned by $x$, highlighting the potential of STVO to achieve the desired TCO performance in the metallic region.

arXiv comment32 pages, 5 main figures, and 7 supplementary figures

References in corpus (21)

• Electronic Structure Calculations with Dynamical Mean-Field Theory: A Spectral Density Functional Approach
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
• Nodal metallic behavior of lightly-doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Missing Quasiparticles and the Chemical Potential Puzzle in the Doping Evolution of the Cuprate Superconductors
• Tailoring the nature and strength of electron-phonon interactions in the SrTiO${}_3$(001) two-dimensional electron liquid
• How chemistry controls electron localization in 3d1 perovskites: A Wannier-function study
• Band-width control in a perovskite-type 3d^1 correlated metal Ca_{1-x}Sr_xVO_3. I. Evolution of the electronic properties and effective mass
• Origin of the crossover from polarons to Fermi liquids in transition metal oxides
• Direct k-space mapping of the electronic structure in an oxide-oxide interface
• Momentum-resolved spectral functions of SrVO${}_3$ calculated by LDA+DMFT
• Hole-doping-induced changes in the electronic structure of La${}_{1-x}$Sr${}_x$FeO${}_3$ : soft x-ray photoemission and absorption study of epitaxial thin films
• Direct observation of the mass renormalization in SrVO${}_3$ by angle resolved photoemission spectroscopy
• Doping-dependent band structure of LaAlO${}_3$/SrTiO${}_3$ interfaces by soft x-ray polarization-controlled resonant angle-resolved photoemission
• Self-Energy Effects on the Low- to High-Energy Electronic Structure of SrVO3
• Mass renormalization in the band width-controlled Mott-Hubbard systems SrVO3 and CaVO3 studied by angle-resolved photoemission spectroscopy
• Critical test for Altshuler-Aronov theory: Evolution of the density of states singularity in double perovskite Sr${}_2$FeMoO${}_6$ with controlled disorder
• Photoemission Spectral Weight Transfer and Mass Renormalization in the Fermi-Liquid System La${}_{1-x}$Sr${}_x$TiO${}_{3+y/2}$
• Origin of the anomalous mass renormalization in metallic quantum well states of correlated oxide SrVO${}_3$
• Gradual Disappearance of the Fermi Surface near the Metal-Insulator Transition in La${}_{1-x}$Sr${}_x$MnO${}_3$
• Emergence of quantum critical behavior in metallic quantum-well states of strongly correlated oxides

Cited by in corpus (2)

• Electronic band structure of Ti2O3 thin films studied by angle-resolved photoemission spectroscopy
• Electronic phase diagram of Cr-doped VO2 epitaxial films studied by in situ photoemission spectroscopy