Resonant soft x-ray emission as a bulk probe of correlated electron behavior in metallic Sr${}_x$Ca${}_{1-x}$VO${}_3$

Abstract

The evolution of electron correlation in Sr${}_x$Ca${}_{1-x}$VO${}_3$ has been studied using a combination of bulk-sensitive resonant soft x-ray emission spectroscopy (RXES), surface-sensitive photoemission spectroscopy (PES), and ab initio band structure calculations. We show that the effect of electron correlation is enhanced at the surface. Strong incoherent Hubbard subbands are found to lie ~ 20% closer in energy to the coherent quasiparticle features in surface-sensitive PES measurements compared with those from bulk-sensitive RXES, and a ~ 10% narrowing of the overall bandwidth at the surface is also observed.

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Cited by in corpus (9)

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• Description of resonant inelastic x-ray scattering in correlated metals
• Enhanced electron correlations at the SrxCa1-xVO3 surface
• Quantum Confinement Induced Metal-Insulator Transition in Strongly Correlated Quantum Wells of SrVO${}_3$ Superlattice
• Nano-engineering of electron correlation in oxide superlattices
• Low-energy V t2g orbital excitations in NdVO3
• Dynamical screening in SrVO${}_3$: Inelastic x-ray scattering experiments and ab initio calculations