Abstract
We report a first-principles density-functional calculation of the electronic structure and properties of the recently discovered superconducting β-pyrochlore oxide KOs2O6. We find that the electronic structure near the Fermi energy EF is dominated by strongly hybridized Os 5d and O 2p states. A van Hove singularity very close to Ef leads to a relatively large density of states at EF, and the Fermi surface exhibits strong nesting along several directions. These features could provide the scattering processes leading to the observed anomalous temperature dependence of the resistivity and to the rather large specific-heat mass enhancement we obtain from the calculated density of states and the observed specific-heat coefficient. An estimate of Tc within the framework of the BCS theory of superconductivity taking into account the possible effects of spin fluctuations arising from nesting yields the experimental value.
Recommended Citation
R. Saniz et al., "Electronic structure properties and BCS superconductivity in ß-pyrochlore oxides: KOss₂O₆," Physical Review B (Condensed Matter), vol. 70, no. 10, pp. 100505-1 - 100505-4, American Physical Society (APS), Sep 2004.
The definitive version is available at https://doi.org/10.1103/PhysRevB.70.100505
Department(s)
Physics
Keywords and Phrases
Beta Pyrochlore Oxide; Metal Oxide; Unclassified Drug; Chemical Structure; Density; Density Functional Theory; Electronics; Energy; Mathematical Analysis; Superconductor; Temperature Dependence
International Standard Serial Number (ISSN)
0163-1829
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2004 American Physical Society (APS), All rights reserved.
Publication Date
01 Sep 2004
