Photoemission study of (V${}_{1-x}$M${}_x$)${}_2$O${}_3$ (M=Cr, Ti)

Abstract

We present high-resolution bulk-sensitive photoemission spectra of (V${}_{1-x}$M${}_x$)${}_2$O${}_3$ (M=Cr, Ti). The measurements were made for the paramagnetic metal (PM), paramagnetic insulator (PI), and antiferromagnetic insulator (AFI) phases of (V${}_{1-x}$M${}_x$)${}_2$O${}_3$ with the samples of $x$ = 0, 0.012, and 0.028 for Cr-doping and $x$ = 0.01 for Ti-doping. In the PM phase, we observe a prominent quasiparticle peak in general agreement with theory, which combines dynamical mean-field theory with the local density approximation (LDA+DMFT). The quasiparticle peak shows a significantly larger peak width and weight than in the theory. For both the PI and AFI phases, the vanadium 3d parts of the valence spectra are not simple one peak structures. For the PI phase, there is not yet a good theoretical understanding of these structures. The size of the electron removal gap increases, and spectral weight accumulates in the energy range closer to the chemical potential, when the PI to AFI transition occurs. Spectra taken in the same phases with different compositions show interesting monotonic changes as the dopant concentration increases, regardless of the dopant species. With increased Cr-doping, the AFI phase gap decreases and the PI phase gap increases.

13 pages, 16 figures. accepted for publication in Physical Review B

Cited by in corpus (14)

• Iron pnictides as a new setting for quantum criticality
• A Microscopic View on the Mott transition in Chromium-doped V2O3
• Mott-Hubbard transition in V2O3 revisited
• Ultrafast evolution and transient phases of the prototype out-of-equilibrium Mott-Hubbard material V2O3
• Correlation effects in the iron pnictides
• Metal-Insulator Transition and Lattice Instability of Paramagnetic V2O3
• Room temperature Mott metal-insulator transition in V2O3 compounds induced via strain-engineering
• Surface dead layer for quasiparticles near a Mott transition
• GW approximation with LSDA+U method and applications to NiO, MnO, and V${}_2$O${}_3$
• How chromium doping affects the correlated electronic structure of V2O3
• Optical properties of V2O3 in its whole phase diagram
• Fermi Surface of Metallic V${}_2$O${}_3$ from Angle-Resolved Photoemission: Mid-level Filling of $e_g^{\pi }$ Bands
• Imaging the itinerant-to-localized transmutation of electrons across the metal-to-insulator transition in V${}_2$O${}_3$
• Role of surface termination in the metal-insulator transition of V${}_2$O${}_3$(0001) ultrathin films