Abstract
ReO${}_{3}$ is a remarkable transition metal oxide in that it has the highest conductivity of all oxides, comparable even with that of silver. Using state of the art bulk-sensitive angle-resolved photoelectron spectroscopy, the authors are able to observe clear dispersions of the Re 5$d$ and O 2$p$ derived bands as well as the momentum splitting of the Fermi surface due to the Re 5$d$ spin-orbit interaction. The experimental results are compared quantitatively to density functional theory band structure calculations, thereby providing a deeper understanding of the material class of the 5$d$ oxides.
Highlights
Transition-metal oxides display a remarkably wide range of fascinating physical phenomena
We have investigated the electronic structure of the metallic oxide ReO3 using bulk-sensitive angle-resolved soft-x-ray and angle-integrated hard-x-ray photoelectron spectroscopy
The generalized gradient approximation (GGA) results in panel (a) reproduce the general features obtained in earlier calculations [20,21,22,23,24,25]: the Re 5d and the O 2p states contribute to the density of states (DOS) in the energy range from −9 to −3.7 eV and from −1.5 eV and up
Summary
Transition-metal oxides display a remarkably wide range of fascinating physical phenomena. These include metalinsulator and spin-state transitions, colossal magnetoresistance, superconductivity, and multiferroicity [1,2,3,4]. The oxide ReO3 is in this respect quite atypical: it is nonmagnetic [5], despite its d shell being partially filled, and it is highly metallic. It has the highest conductivity of all oxides, comparable with that of copper or silver [6,7,8,9]. The material readily absorbs hydrogen due to the vacant body-centered lattice site and finds application as a hydrogenation catalyst in the chemical industry [18,19]
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