Three-dimensional band structure of highly metallic Na0.8WO3 by angle-resolved photoemission spectroscopy

Raj, Satyabrata ; Chakraborty, Anirban ; Choudhury, Debraj ; Sato, Takafumi ; Takahashi, Takashi ; Mahadevan, Priya ; Fujii, Jun ; Vobornik, Ivana ; Sarma, D. D. (2009) Three-dimensional band structure of highly metallic Na0.8WO3 by angle-resolved photoemission spectroscopy Physical Review B: Condensed Matter and Materials Physics, 79 (3). Article ID 035119. ISSN 2469-9950

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Official URL: http://journals.aps.org/prb/abstract/10.1103/PhysR...

Related URL: http://dx.doi.org/10.1103/PhysRevB.79.035119

Abstract

Three-dimensional electronic structure of highly metallic sodium tungsten bronze, Na0.8WO3, is investigated by high-resolution angle-resolved photoemission spectroscopy. The experimentally determined valence-band structure along the momentum directions both parallel and perpendicular to the surface has been compared with the results of ab initio band-structure calculation. The angle-resolved photoemission spectroscopy spectra for different photon energies reveal that possibly the oxygen vacancies in the system are responsible for the evolution of density of states at the top of Γ point in experimental valence band. The band dispersion around Γ(X) point leading to an electronlike Fermi surface is well predicted by the band calculation. As we move from bulk-sensitive to more-surface-sensitive photon energy, we found emergence of Fermi surfaces at X(M) and M(R) points similar to the one at Γ(X) point, suggesting the reconstruction of surface due to rotation/deformation of WO6 octahedra.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:102970
Deposited On:02 Feb 2018 03:56
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