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Influence of germanium substitution on the structural and electronic stability of the competing vanadium dioxide phases

Peter Mlkvik1*, Claude Ederer1, Nicola A. Spaldin1

1 Materials Theory, Department of Materials, ETH Z├╝rich

* Corresponding authors emails: peter.mlkvik@mat.ethz.ch
DOI10.24435/materialscloud:rp-k1 [version v1]

Publication date: Jan 06, 2023

How to cite this record

Peter Mlkvik, Claude Ederer, Nicola A. Spaldin, Influence of germanium substitution on the structural and electronic stability of the competing vanadium dioxide phases, Materials Cloud Archive 2023.2 (2023), doi: 10.24435/materialscloud:rp-k1.

Description

We present a density-functional theory (DFT) study of the structural, electronic, and chemical bonding behavior in germanium (Ge)-doped vanadium dioxide (VO2). Our motivation is to explain the reported increase of the metal-insulator transition temperature under Ge doping and to understand how much of the fundamental physics and chemistry behind it can be captured at the conventional DFT level. We model doping using a supercell approach, with various concentrations and different spatial distributions of Ge atoms in VO2. Our results suggest that the addition of Ge atoms strongly perturbs the high-symmetry metallic rutile phase and induces structural distortions that partially resemble the dimerization of the experimental insulating structure. Our work, therefore, hints at a possible explanation of the observed increase in transition temperature under Ge doping, motivating further studies into understanding the interplay of structural and electronic transitions in VO2.

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Keywords

DFT VO2 doping

Version history:

2023.2 (version v1) [This version] Jan 06, 2023 DOI10.24435/materialscloud:rp-k1