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    Breakdown of the Stokes-Einstein relation above the melting temperature in a liquid phase-change material.

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    Author
    Wei, Shuai
    Evenson, Zach
    Stolpe, Moritz
    Lucas, Pierre
    Angell, C Austen
    Affiliation
    Univ Arizona, Dept Mat Sci & Engn
    Issue Date
    2018-11-01
    
    Metadata
    Show full item record
    Publisher
    AMER ASSOC ADVANCEMENT SCIENCE
    Citation
    Wei, S., Evenson, Z., Stolpe, M., Lucas, P., & Angell, C. A. (2018). Breakdown of the Stokes-Einstein relation above the melting temperature in a liquid phase-change material. Science advances, 4(11), eaat8632.
    Journal
    SCIENCE ADVANCES
    Rights
    Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The dynamic properties of liquid phase-change materials (PCMs), such as viscosity η and the atomic self-diffusion coefficient D, play an essential role in the ultrafast phase switching behavior of novel nonvolatile phase-change memory applications. To connect η to D, the Stokes-Einstein relation (SER) is commonly assumed to be valid at high temperatures near or above the melting temperature Tm and is often used for assessing liquid fragility (or crystal growth velocity) of technologically important PCMs. However, using quasi-elastic neutron scattering, we provide experimental evidence for a breakdown of the SER even at temperatures above Tm in the high-atomic mobility state of a PCM, Ge1Sb2Te4. This implies that although viscosity may have strongly increased during cooling, diffusivity can remain high owing to early decoupling, being a favorable feature for the fast phase switching behavior of the high-fluidity PCM. We discuss the origin of the observation and propose the possible connection to a metal-semiconductor and fragile-strong transition hidden below Tm.
    Note
    Open access journal
    ISSN
    2375-2548
    PubMed ID
    30515453
    DOI
    10.1126/sciadv.aat8632
    Version
    Final published version
    Sponsors
    FRM II; Feodor Lynen Postdoctoral Research Fellowship of the Alexander von Humboldt Foundation; Place-to-be RWTH Start-Up fund; DFG [SFB917]; NSF-EFRI award [1640860]; National Science Foundation Research [CHE-1213265]
    Additional Links
    https://advances.sciencemag.org/content/4/11/eaat8632
    ae974a485f413a2113503eed53cd6c53
    10.1126/sciadv.aat8632
    Scopus Count
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    UA Faculty Publications

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