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27 April 2024

» arxiv » 1008.4905

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Fermiology of Sr4V2O6Fe2As2: Quasi-Nested Fe vs Mott-Insulating V Orbitals
T. Qian ; N. Xu ; Y.-B. Shi ; K. Nakayama ; P. Richard ; T. Kawahara ; T. Sato ; T. Takahashi ; M. Neupane ; Y.-M. Xu ; X.-P. Wang ; G. Xu ; X. Dai ; Z. Fang ; P. Cheng ; H.-H. Wen ; H. Ding ;
Date:	29 Aug 2010
Abstract:	We have performed an angle-resolved photoemission spectroscopy study of a new iron-based superconductor Sr4V2O6Fe2As2. While V 3d orbitals are found to be in a Mott insulator state and show an incoherent peak at ~ 1 eV below the Fermi level, the dispersive Fe 3d bands form several hole- and electron-like Fermi surfaces (FSs), some of which are quasi-nested by the (pi, 0) wave vector. This differs from the local density approximation (LDA) calculations, which predict non-nested FSs for this material. However, LDA+U with a large effective Hubbard energy U on V 3d electrons can reproduce the experimental observation reasonably well. The observed fermiology in superconducting Sr4V2O6Fe2As2 strongly supports that (pi, 0) interband scattering between quasi-nested FSs is indispensable to superconductivity in pnictides.
Source:	arXiv, 1008.4905
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