Nanoscale Phase Separation and Lattice Complexity in VO2: The Metal–Insulator Transition Investigated by XANES via Auger Electron Yield at the Vanadium L23-Edge and Resonant Photoemission
Among transition metal oxides, VO2 is a particularly interesting and challenging correlated electron material where an insulator to metal transition (MIT) occurs near room temperature. Here we investigate a 16 nm thick strained vanadium dioxide film, trying to clarify the dynamic behavior of the ins...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-12-01
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| Series: | Condensed Matter |
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| Online Access: | https://www.mdpi.com/2410-3896/2/4/38 |
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| author | Augusto Marcelli Marcello Coreno Matus Stredansky Wei Xu Chongwen Zou Lele Fan Wangsheng Chu Shiqiang Wei Albano Cossaro Alessandro Ricci Antonio Bianconi Alessandro D’Elia |
| author_facet | Augusto Marcelli Marcello Coreno Matus Stredansky Wei Xu Chongwen Zou Lele Fan Wangsheng Chu Shiqiang Wei Albano Cossaro Alessandro Ricci Antonio Bianconi Alessandro D’Elia |
| author_sort | Augusto Marcelli |
| collection | DOAJ |
| description | Among transition metal oxides, VO2 is a particularly interesting and challenging correlated electron material where an insulator to metal transition (MIT) occurs near room temperature. Here we investigate a 16 nm thick strained vanadium dioxide film, trying to clarify the dynamic behavior of the insulator/metal transition. We measured (resonant) photoemission below and above the MIT transition temperature, focusing on heating and cooling effects at the vanadium L23-edge using X-ray Absorption Near-Edge Structure (XANES). The vanadium L23-edges probe the transitions from the 2p core level to final unoccupied states with 3d orbital symmetry above the Fermi level. The dynamics of the 3d unoccupied states both at the L3- and at the L2-edge are in agreement with the hysteretic behavior of this thin film. In the first stage of the cooling, the 3d unoccupied states do not change while the transition in the insulating phase appears below 60 °C. Finally, Resonant Photoemission Spectra (ResPES) point out a shift of the Fermi level of ~0.75 eV, which can be correlated to the dynamics of the 3d// orbitals, the electron–electron correlation, and the stability of the metallic state. |
| first_indexed | 2024-04-13T08:47:31Z |
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| institution | Directory Open Access Journal |
| issn | 2410-3896 |
| language | English |
| last_indexed | 2024-04-13T08:47:31Z |
| publishDate | 2017-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Condensed Matter |
| spelling | doaj.art-1d73a7e8e1b6475b8c8077e1b3a052832022-12-22T02:53:36ZengMDPI AGCondensed Matter2410-38962017-12-01243810.3390/condmat2040038condmat2040038Nanoscale Phase Separation and Lattice Complexity in VO2: The Metal–Insulator Transition Investigated by XANES via Auger Electron Yield at the Vanadium L23-Edge and Resonant PhotoemissionAugusto Marcelli0Marcello Coreno1Matus Stredansky2Wei Xu3Chongwen Zou4Lele Fan5Wangsheng Chu6Shiqiang Wei7Albano Cossaro8Alessandro Ricci9Antonio Bianconi10Alessandro D’Elia11Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, 00044 Frascati, ItalyISM-CNR, Istituto Struttura della Materia, LD2 Unit, Basovizza Area Science Park, 34149 Trieste, ItalyDepartment of Physics, University of Trieste, Via A. Valerio 2, 34127 Trieste, ItalyRICMASS, Rome International Center for Materials Science Superstripes, Via dei Sabelli 119A, 00185 Rome, ItalyNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, ChinaKey Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, ChinaNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, ChinaNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, ChinaIOM-CNR, Laboratorio Nazionale TASC, Basovizza SS-14, km 163.5, 34012 Trieste, ItalyRICMASS, Rome International Center for Materials Science Superstripes, Via dei Sabelli 119A, 00185 Rome, ItalyRICMASS, Rome International Center for Materials Science Superstripes, Via dei Sabelli 119A, 00185 Rome, ItalyDepartment of Physics, University of Trieste, Via A. Valerio 2, 34127 Trieste, ItalyAmong transition metal oxides, VO2 is a particularly interesting and challenging correlated electron material where an insulator to metal transition (MIT) occurs near room temperature. Here we investigate a 16 nm thick strained vanadium dioxide film, trying to clarify the dynamic behavior of the insulator/metal transition. We measured (resonant) photoemission below and above the MIT transition temperature, focusing on heating and cooling effects at the vanadium L23-edge using X-ray Absorption Near-Edge Structure (XANES). The vanadium L23-edges probe the transitions from the 2p core level to final unoccupied states with 3d orbital symmetry above the Fermi level. The dynamics of the 3d unoccupied states both at the L3- and at the L2-edge are in agreement with the hysteretic behavior of this thin film. In the first stage of the cooling, the 3d unoccupied states do not change while the transition in the insulating phase appears below 60 °C. Finally, Resonant Photoemission Spectra (ResPES) point out a shift of the Fermi level of ~0.75 eV, which can be correlated to the dynamics of the 3d// orbitals, the electron–electron correlation, and the stability of the metallic state.https://www.mdpi.com/2410-3896/2/4/38vanadium dioxideresonant photoemissionmetal–insulator transitionXANESAuger electron yieldstrained filmphase separation |
| spellingShingle | Augusto Marcelli Marcello Coreno Matus Stredansky Wei Xu Chongwen Zou Lele Fan Wangsheng Chu Shiqiang Wei Albano Cossaro Alessandro Ricci Antonio Bianconi Alessandro D’Elia Nanoscale Phase Separation and Lattice Complexity in VO2: The Metal–Insulator Transition Investigated by XANES via Auger Electron Yield at the Vanadium L23-Edge and Resonant Photoemission Condensed Matter vanadium dioxide resonant photoemission metal–insulator transition XANES Auger electron yield strained film phase separation |
| title | Nanoscale Phase Separation and Lattice Complexity in VO2: The Metal–Insulator Transition Investigated by XANES via Auger Electron Yield at the Vanadium L23-Edge and Resonant Photoemission |
| title_full | Nanoscale Phase Separation and Lattice Complexity in VO2: The Metal–Insulator Transition Investigated by XANES via Auger Electron Yield at the Vanadium L23-Edge and Resonant Photoemission |
| title_fullStr | Nanoscale Phase Separation and Lattice Complexity in VO2: The Metal–Insulator Transition Investigated by XANES via Auger Electron Yield at the Vanadium L23-Edge and Resonant Photoemission |
| title_full_unstemmed | Nanoscale Phase Separation and Lattice Complexity in VO2: The Metal–Insulator Transition Investigated by XANES via Auger Electron Yield at the Vanadium L23-Edge and Resonant Photoemission |
| title_short | Nanoscale Phase Separation and Lattice Complexity in VO2: The Metal–Insulator Transition Investigated by XANES via Auger Electron Yield at the Vanadium L23-Edge and Resonant Photoemission |
| title_sort | nanoscale phase separation and lattice complexity in vo2 the metal insulator transition investigated by xanes via auger electron yield at the vanadium l23 edge and resonant photoemission |
| topic | vanadium dioxide resonant photoemission metal–insulator transition XANES Auger electron yield strained film phase separation |
| url | https://www.mdpi.com/2410-3896/2/4/38 |
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