Initial structure memory of pressure-induced changes in the phase-change memory alloy Ge2Sb2Te5

M. Krbal, A. V. Kolobov, J. Haines, P. Fons, C. Levelut, R. Le Parc, M. Hanfland, J. Tominaga, A. Pradel, M. Ribes

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Abstract

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.

Original languageEnglish
Article number115502
JournalPhysical review letters
Volume103
Issue number11
DOIs
Publication statusPublished - 2009 Sep 9
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Krbal, M., Kolobov, A. V., Haines, J., Fons, P., Levelut, C., Le Parc, R., Hanfland, M., Tominaga, J., Pradel, A., & Ribes, M. (2009). Initial structure memory of pressure-induced changes in the phase-change memory alloy Ge2Sb2Te5. Physical review letters, 103(11), [115502]. https://doi.org/10.1103/PhysRevLett.103.115502