Initial Structure Memory of Pressure-Induced Changes in the Phase-Change Memory AlloyGe2Sb2Te5
| Autor: | Claire Levelut, Paul Fons, Annie Pradel, Julien Haines, M. Krbal, Michel Ribes, Junji Tominaga, R. Le Parc, Michael Hanfland, Alexander V. Kolobov |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Condensed matter physics Alloy General Physics and Astronomy 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Compression (physics) 01 natural sciences Amorphous solid law.invention Phase-change memory law Phase (matter) Metastability 0103 physical sciences X-ray crystallography engineering Hydrostatic equilibrium 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review Letters. 103 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | We demonstrate that while the metastable face-centered cubic (fcc) phase of Ge2Sb2Te5 becomes amorphous under hydrostatic compression at about 15 GPa, the stable trigonal phase remains crystalline. Upon higher compression, a body-centered cubic phase is obtained in both cases around 30 GPa. Upon decompression, the amorphous phase is retained for the starting fcc phase while the initial structure is recovered for the starting trigonal phase. We argue that the presence of vacancies and associated subsequent large atomic displacements lead to nanoscale phase separation and loss of initial structure memory in the fcc staring phase of Ge2Sb2Te5. |
| Databáze: | OpenAIRE |
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