Journal
NANOMATERIALS
Volume 11, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/nano11010097
Keywords
band structure; DFT; superconductivity
Categories
Funding
- RFBR [18-02-00281, 20-02-00011]
- Government of Krasnoyarsk Territory
- Krasnoyarsk Regional Fund of Science [19-42-240007]
- Program of Ministry of Education and Science of the Russian Federation [2020-1902-01-239]
- RFBR
- [MK-1683.2019.2]
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The band structure, density of states, and Fermi surface of the oxygen-deficient tungsten oxide WO2.9 (equivalent to W20O58) were studied using density functional theory. Despite the complexity of the structure, the low-energy band structure is feasible, mainly influenced by specific distortions in the structure.
The band structure, density of states, and the Fermi surface of a recently discovered superconductor, oxygen-deficient tungsten oxide WO2.9 that is equivalent to W20O58, is studied within the density functional theory (DFT) in the generalized gradient approximation (GGA). Here we show that despite the extremely complicated structure containing 78 atoms in the unit cell, the low-energy band structure is quite feasible. Fermi level is crossed by no more than 10 bands per one spin projection (and even 9 bands per pseudospin projection when the spin-orbit coupling is considered) originating from the t2g 5d-orbitals of tungsten atoms forming zigzag chains. These bands become occupied because of the specific zigzag octahedra distortions. To demonstrate the role of distortions, we compare band structures of W20O58 with the real crystal structure and with the idealized one. We also propose a basis for a minimal low-energy tight-binding model for W20O58.
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