Origin of the unusual reflectance and density contrasts in the phase-change material Cu2GeTe3

J. M. Skelton, K. Kobayashi, Y. Sutou, S. R. Elliott

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The recent demonstration of Cu2GeTe3 (CGT) as a potential phase-change material (PCM) for next-generation non-volatile memories represents a significant discovery. In contrast to widely studied PCMs, amorphous CGT is denser and more reflective than crystalline CGT, and the phase transition takes place to a tetrahedrally bonded crystal, a very different geometry to the octahedrally bonded cubic structures adopted by other PCMs. We have performed a computer-simulational study of CGT, investigating the atomic-level structure and physical properties of both phases. Our results lead to hypotheses to account for the higher amorphous-phase density and reflectivity, which may provide new design criteria for identifying novel PCMs.

Original languageEnglish
Article number224105
JournalApplied Physics Letters
Volume102
Issue number22
DOIs
Publication statusPublished - 2013 Jun 3

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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