Electronic Structure of UGe$_{2\pm x}$ Thin Films from Photoelectron Spectroscopy
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866908985282527232 |
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| author | Alex, Sonu George Romanyuk, Oleksandr Zorilo, Ivan Andreev, Alexander Huber, Frank Gouder, Thomas Malinsky, Petr Siddiqui, Maliha Shick, Alexander B. Tereshina-Chitrova, Evgenia A. |
| author_facet | Alex, Sonu George Romanyuk, Oleksandr Zorilo, Ivan Andreev, Alexander Huber, Frank Gouder, Thomas Malinsky, Petr Siddiqui, Maliha Shick, Alexander B. Tereshina-Chitrova, Evgenia A. |
| contents | Uranium digermanide UGe$_2$, the first ferromagnetic superconductor, represents a key composition in the U-Ge system dominated by U-5$f$ states. To examine the impact of controlled stoichiometric deviations on the electronic structure, UGe$_{2\pm x}$ thin films ($0 \le x \le 1$) were prepared by triode sputtering and studied on pristine surfaces by X-ray (XPS) and Ultraviolet (UPS) photoelectron spectroscopy. XPS and UPS reveal a robust metallic valence band with a dominant U-5$f$ contribution at the Fermi level and a broad incoherent feature at higher binding energies, without qualitative changes in spectral line shape across the composition range. The experimental spectrum of UGe$_2$ thin films is well reproduced by DFT+U(ED) valence-band calculations combining density functional theory with exact diagonalization of the multiconfigurational U-5$f$ shell. These results demonstrate that the overall U-Ge electronic framework of UGe$_2$ thin films remains resilient to moderate stoichiometric deviations, providing a reliable electronic baseline for future studies of interface- and heterostructure-driven phenomena in uranium-based systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_03902 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electronic Structure of UGe$_{2\pm x}$ Thin Films from Photoelectron Spectroscopy Alex, Sonu George Romanyuk, Oleksandr Zorilo, Ivan Andreev, Alexander Huber, Frank Gouder, Thomas Malinsky, Petr Siddiqui, Maliha Shick, Alexander B. Tereshina-Chitrova, Evgenia A. Strongly Correlated Electrons Uranium digermanide UGe$_2$, the first ferromagnetic superconductor, represents a key composition in the U-Ge system dominated by U-5$f$ states. To examine the impact of controlled stoichiometric deviations on the electronic structure, UGe$_{2\pm x}$ thin films ($0 \le x \le 1$) were prepared by triode sputtering and studied on pristine surfaces by X-ray (XPS) and Ultraviolet (UPS) photoelectron spectroscopy. XPS and UPS reveal a robust metallic valence band with a dominant U-5$f$ contribution at the Fermi level and a broad incoherent feature at higher binding energies, without qualitative changes in spectral line shape across the composition range. The experimental spectrum of UGe$_2$ thin films is well reproduced by DFT+U(ED) valence-band calculations combining density functional theory with exact diagonalization of the multiconfigurational U-5$f$ shell. These results demonstrate that the overall U-Ge electronic framework of UGe$_2$ thin films remains resilient to moderate stoichiometric deviations, providing a reliable electronic baseline for future studies of interface- and heterostructure-driven phenomena in uranium-based systems. |
| title | Electronic Structure of UGe$_{2\pm x}$ Thin Films from Photoelectron Spectroscopy |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2601.03902 |