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We have performed an angle-resolved photoemission spectroscopy study of a newiron-based superconductor Sr4V2O6Fe2As2. While V 3d orbitals are found to be ina Mott insulator state and show an incoherent peak at ~ 1 eV below the Fermilevel, the dispersive Fe 3d bands form several hole- and electron-like Fermisurfaces (FSs), some of which are quasi-nested by the (pi, 0) wave vector. Thisdiffers from the local density approximation (LDA) calculations, which predictnon-nested FSs for this material. However, LDA+U with a large effective Hubbardenergy U on V 3d electrons can reproduce the experimental observationreasonably well. The observed fermiology in superconducting Sr4V2O6Fe2As2strongly supports that (pi, 0) interband scattering between quasi-nested FSs isindispensable to superconductivity in pnictides.

Fermiology of Sr4V2O6Fe2As2: Quasi-Nested Fe vs Mott-Insulating V Orbitals