| 1. |
- Guo, Yefei, et al.
(författare)
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Electronic Correlations in Multiferroic Van der Waals CuCrP2S6 : Insights from X-ray Spectroscopy and DFT
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Ingår i: Journal of Physical Chemistry C. - 1932-7447. ; 128:18, s. 7830-7839
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Tidskriftsartikel (refereegranskat)abstract
- The electronic structure of high-quality van der Waals multiferroic CuCrP2S6 crystals was investigated by applying photoelectron spectroscopy methods in combination with DFT analysis. Using X-ray photoelectron and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy at the Cu L2,3 and Cr L2,3 absorption edges, we determine the charge states of ions in the studied compound. Analyzing the systematic NEXAFS and resonant photoelectron spectroscopy data at the Cu/Cr L2,3 absorption edges allowed us to assign the CuCrP2S6 material to a Mott-Hubbard type insulator and identify different Auger-decay channels (participator vs spectator) during absorption and autoionization processes. Spectroscopic and theoretical data obtained for CuCrP2S6 are very important for the detailed understanding of the electronic structure and electron-correlations phenomena in different layered materials, which will drive their further applications in different areas, like electronics, spintronics, sensing, and catalysis.
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| 2. |
- Jin, Yukun, et al.
(författare)
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Mixed Insulating State for van der Waals CoPS3
- 2022
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Ingår i: Journal of Physical Chemistry Letters. - : American Chemical Society (ACS). - 1948-7185. ; 13:45, s. 10486-10493
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Tidskriftsartikel (refereegranskat)abstract
- Large-scale high-quality van der Waals CoPS3single crystals are synthesized using a chemical vapor transport (CVT) method. The crystallographic structure and electronic properties of this layered material are systematically studied using different spectroscopic methods (XPS, NEXAFS, and resonant photoelectron spectroscopy) accompanied by density functional theory (DFT) calculations. All experimental and theoretical data allow assignment of this material to the class of mixed Mott-Hubbard/charge-transfer insulator with Udd≅ Δ. All obtained results can enrich the information on the new class of van der Waals materials, transition metal phosphorus trichalcogenides, and help to further effectively exploit their electronic, optical, and transport properties, which are important for adopting this kind of materials into different application areas, such as spintronics and catalysis.
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