Electronic structure of the BaTi${}_2$As${}_2$O parent compound of the titanium based oxypnictide superconductor

Abstract

The electronic structure of BaTi2As2O, a parent compound of the newly discovered titanium-based oxypnictide superconductors, is studied by angle-resolved photoemission spectroscopy. The electronic structure shows multi-orbital nature and possible three-dimensional character. An anomalous temperature-dependent spectral weight redistribution and broad lineshape indicate the incoherent nature of the spectral function. At the density-wave-like transition temperature around 200 K, a partial gap opens at the Fermi patches. These findings suggest that BaTi2As2O is likely a charge density wave material in the strong interaction regime.

7 pages, 7 figures

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• Weak metal-metal transition in the vanadium oxytelluride Rb${}_{1-\delta }$V${}_2$Te${}_2$O
• Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors
• Orientation-dependent electron-phonon coupling in interfacial superconductors LaAlO3/KTaO3
• Phonon dispersions and Fermi surfaces nesting explaining the variety of charge ordering in titanium-oxypnictides superconductors
• Correlation-induced self-doping in intercalated iron-pnictide superconductor Ba2Ti2Fe2As4O
• Theoretical Prediction of the Nematic Orbital-Ordered State in Ti-Oxypnictide Superconductor BaTi2(As,Sb)2O
• Photoemission study of the electronic structure and charge density waves of Na2Ti2Sb2O
• The weak electronic correlations and absence of heavy Fermion state in KNi${}_2$Se${}_2$
• Revealing the hidden order in BaTi2As2O via nuclear magnetic resonance