Femtosecond x-ray diffraction reveals a liquid–liquid phase transition in phase-change materials
(2019) In Science 364(6445). p.1062-1067- Abstract
In phase-change memory devices, a material is cycled between glassy and crystalline states. The highly temperature-dependent kinetics of its crystallization process enables application in memory technology, but the transition has not been resolved on an atomic scale. Using femtosecond x-ray diffraction and ab initio computer simulations, we determined the time-dependent pair-correlation function of phase-change materials throughout the melt-quenching and crystallization process. We found a liquid–liquid phase transition in the phase-change materials Ag4In3Sb67Te26 and Ge15Sb85 at 660 and 610 kelvin, respectively. The transition is predominantly caused by the onset of... (More)
In phase-change memory devices, a material is cycled between glassy and crystalline states. The highly temperature-dependent kinetics of its crystallization process enables application in memory technology, but the transition has not been resolved on an atomic scale. Using femtosecond x-ray diffraction and ab initio computer simulations, we determined the time-dependent pair-correlation function of phase-change materials throughout the melt-quenching and crystallization process. We found a liquid–liquid phase transition in the phase-change materials Ag4In3Sb67Te26 and Ge15Sb85 at 660 and 610 kelvin, respectively. The transition is predominantly caused by the onset of Peierls distortions, the amplitude of which correlates with an increase of the apparent activation energy of diffusivity. This reveals a relationship between atomic structure and kinetics, enabling a systematic optimization of the memory-switching kinetics.
(Less)
- author
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Science
- volume
- 364
- issue
- 6445
- pages
- 6 pages
- publisher
- American Association for the Advancement of Science (AAAS)
- external identifiers
-
- pmid:31197008
- scopus:85067625790
- ISSN
- 0036-8075
- DOI
- 10.1126/science.aaw1773
- language
- English
- LU publication?
- yes
- id
- 5b81bf10-96fb-4ad5-bcab-20b1c5d25bde
- date added to LUP
- 2019-07-04 17:10:07
- date last changed
- 2024-09-19 05:34:26
@article{5b81bf10-96fb-4ad5-bcab-20b1c5d25bde, abstract = {{<p>In phase-change memory devices, a material is cycled between glassy and crystalline states. The highly temperature-dependent kinetics of its crystallization process enables application in memory technology, but the transition has not been resolved on an atomic scale. Using femtosecond x-ray diffraction and ab initio computer simulations, we determined the time-dependent pair-correlation function of phase-change materials throughout the melt-quenching and crystallization process. We found a liquid–liquid phase transition in the phase-change materials Ag<sub>4</sub>In<sub>3</sub>Sb<sub>67</sub>Te<sub>26</sub> and Ge<sub>15</sub>Sb<sub>85</sub> at 660 and 610 kelvin, respectively. The transition is predominantly caused by the onset of Peierls distortions, the amplitude of which correlates with an increase of the apparent activation energy of diffusivity. This reveals a relationship between atomic structure and kinetics, enabling a systematic optimization of the memory-switching kinetics.</p>}}, author = {{Zalden, Peter and Quirin, Florian and Schumacher, Mathias and Siegel, Jan and Wei, Shuai and Koc, Azize and Nicoul, Matthieu and Trigo, Mariano and Andreasson, Pererik and Enquist, Henrik and Shu, Michael J. and Pardini, Tommaso and Chollet, Matthieu and Zhu, Diling and Lemke, Henrik and Ronneberger, Ider and Larsson, Jörgen and Lindenberg, Aaron M. and Fischer, Henry E. and Hau-Riege, Stefan and Reis, David A. and Mazzarello, Riccardo and Wuttig, Matthias and Sokolowski-Tinten, Klaus}}, issn = {{0036-8075}}, language = {{eng}}, number = {{6445}}, pages = {{1062--1067}}, publisher = {{American Association for the Advancement of Science (AAAS)}}, series = {{Science}}, title = {{Femtosecond x-ray diffraction reveals a liquid–liquid phase transition in phase-change materials}}, url = {{http://dx.doi.org/10.1126/science.aaw1773}}, doi = {{10.1126/science.aaw1773}}, volume = {{364}}, year = {{2019}}, }