Resonant inelastic x-ray scattering study of doping and temperature dependence of low-energy excitations in La${}_{1-x}$Sr${}_x$VO${}_3$

Abstract

We present a temperature and doping dependent resonant inelastic X-ray scattering experiment at the V L${}_{2,3}$ and O K edges in La${}_{1-x}$Sr${}_x$VO${}_3$ for $x=0$ and $x=0.1$. This material is a canonical example of a compound that exhibits a filling control metal-insulator transition and undergoes orbital ordering and antiferromagnetic transitions at low temperature. Temperature dependent measurements at the V L${}_3$ edge reveal an intra-t${}_{2g}$ excitation that blueshifts by 40 meV from room temperature to 30 K at a rate that differs between the para- and antiferromagnetic phases. The lineshape can be partially explained by a purely local model using crystal field theory calculations. At $x=0.1$ the doping is shown to affect the local electronic structure primarily on the O sites, which is in disagreement with a simple Mott-Hubbard picture. We reveal the presence of phonon overtone features at the O K edge, which evidences that the low energy part of the spectrum is dominated by phonon response.

References in corpus (16)

• Orbital-assisted metal-insulator transition in VO${}_2$
• Polar Discontinuity Doping of the LaVO_3/SrTiO_3 Interface
• Orbital fluctuations in the different phases of LaVO3 and YVO3
• Origin of the large phonon band-gap in SrTiO3 and the vibrational signatures of ferroelectricity in ATiO3 perovskite: First principles lattice dynamics and inelastic neutron scattering of PbTiO3, BaTiO3 and SrTiO3
• Lattice Distortion and Magnetism of 3d-$t_{2g}$ Perovskite Oxides
• Evolution of Spin-Orbital-Lattice Coupling in the $R$VO${}_3$ Perovskites
• Tuning the metal-insulator transition in d^1 and d^2 perovskites by epitaxial strain: a first principles-based study
• One-Dimensional Confinement and Enhanced Jahn-Teller Instability in LaVO${}_3$
• Doping variation of anisotropic charge and orbital dynamics in Y1-xCaxVO3 : Comparison with La1-xSrxVO3
• Spin, orbital ordering and magnetic dynamics of LaVO3: magnetization, heat capacity and neutron scattering studies
• Generalization of the Franck-Condon model for phonon excitations by resonant inelastic X-ray scattering
• Structural analysis of strained LaVO${}_3$ thin films
• Interface reconstruction in V-oxide heterostructures determined by x-ray absorption spectroscopy
• Resonant inelastic x-ray scattering probes the electron-phonon coupling in the spin-liquid kappa-(BEDT-TTF)2Cu2(CN)3
• Enhanced charge-transfer character in the monoclinic phase of Mott-insulator LaVO3 thin film
• Low-energy V t2g orbital excitations in NdVO3