Electronic Structure of Transition-Metal Based Cu2GeTe3 Phase Change Material: Revealing the Key Role of Cu d Electrons
| Autor: | Yuta Saito, Keisuke Kobayashi, Satoshi Shindo, Xeniya Kozina, Alexander V. Kolobov, Paul Fons, Yuji Sutou, Jonathan M. Skelton |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Photoemission spectroscopy General Chemical Engineering Nanotechnology 02 engineering and technology General Chemistry Electronic structure Electron Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Phase-change material Fast switching Amorphous solid Transition metal Chemical physics 0103 physical sciences Materials Chemistry 0210 nano-technology |
| Zdroj: | Chemistry of Materials. 29:7440-7449 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.7b02436 |
| Popis: | The electronic structure of the as-deposited amorphous and crystalline phases of the transition-metal based Cu2GeTe3 phase-change material has been systematically investigated using hard-X-ray photoemission spectroscopy and density-functional theory simulations. We shed light on Cu d electrons and reveal that participation of d electrons in the bonding plays an important role during the phase-change process. A large electrical contrast as well as fast switching is preserved even in the tetrahedrally-bonded crystal structure, which does not possess resonant bonding. Based on the obtained results, we propose that transition-metal based phase change materials that have been previously overlooked will be candidates not only for non-volatile memory applications, but also for emerging applications. |
| Databáze: | OpenAIRE |
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