Fragile 3D Order in V1−xMoxO2
| Autor: | Matthew A. Davenport, Tyra C. Douglas, Logan M. Whitt, Chaowei Hu, Raymond Osborn, Ni Ni, Jared M. Allred, M. J. Krogstad, Stephan Rosenkranz |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 127 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.127.125501 |
| Popis: | The metal-to-insulator transition in rutile ${\mathrm{VO}}_{2}$ has proven uniquely difficult to characterize because of the complex interplay between electron correlations and atomic structure. Here, we report the discovery of the sudden collapse of three-dimensional order in the low-temperature phase of ${\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Mo}}_{x}{\mathrm{O}}_{2}$ at $x=0.17$ and the emergence of a novel frustrated two-dimensional order at $x=0.19$, with only a slight change in electronic properties. Single crystal diffuse x-ray scattering reveals that this transition from the 3D $M1$ phase to a 2D variant of the $M2$ phase results in long-range structural correlations along symmetry-equivalent ($11L$) planes of the tetragonal rutile structure, yet extremely short-range correlations transverse to these planes. These findings suggest that this two dimensionality results from a novel form of geometric frustration that is essentially structural in origin. |
| Databáze: | OpenAIRE |
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