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  Competing covalent and ionic bonding in Ge-Sb-Te phase change materials

Mukhopadhyay, S., Sun, J., Subedi, A., Siegrist, T., & Singh, D. J. (2016). Competing covalent and ionic bonding in Ge-Sb-Te phase change materials. Scientific Reports, 6: 25981. doi:10.1038/srep25981.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-E4C7-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-F01D-D
Genre: Journal Article

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http://dx.doi.org/10.1038/srep25981 (Publisher version)
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http://arxiv.org/abs/1605.05997 (Postprint)
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 Creators:
Mukhopadhyay, Saikat1, Author
Sun, Jifeng1, 2, Author
Subedi, Alaska3, Author              
Siegrist, Theo2, Author
Singh, David J.4, Author
Affiliations:
1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6056 USA, ou_persistent22              
2Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, FL 32310, USA, ou_persistent22              
3Theory of Complex Materials, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074318              
4Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211-7010 USA, ou_persistent22              

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Free keywords: Condensed-matter physics; Theory and computation
 Abstract: Ge2Sb2Te5 and related phase change materials are highly unusual in that they can be readily transformed between amorphous and crystalline states using very fast melt, quench, anneal cycles, although the resulting states are extremely long lived at ambient temperature. These states have remarkably different physical properties including very different optical constants in the visible in strong contrast to common glass formers such as silicates or phosphates. This behavior has been described in terms of resonant bonding, but puzzles remain, particularly regarding different physical properties of crystalline and amorphous phases. Here we show that there is a strong competition between ionic and covalent bonding in cubic phase providing a link between the chemical basis of phase change memory property and origins of giant responses of piezoelectric materials (PbTiO3, BiFeO3). This has important consequences for dynamical behavior in particular leading to a simultaneous hardening of acoustic modes and softening of high frequency optic modes in crystalline phase relative to amorphous. This different bonding in amorphous and crystalline phases provides a direct explanation for different physical properties and understanding of the combination of long time stability and rapid switching and may be useful in finding new phase change compositions with superior properties.

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Language(s): eng - English
 Dates: 2016-01-212016-04-222016-05-19
 Publication Status: Published online
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/srep25981
arXiv: 1605.05997
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 25981 Start / End Page: - Identifier: Other: 2045-2322
CoNE: /journals/resource/2045-2322