Ultrafast disordering of vanadium dimers in photoexcited VO 2
| Autor: | Olivier Delaire, Thomas Henighan, David A. Reis, Shan Yang, Michael Kozina, Lynn A. Boatner, Tetsuo Katayama, Mason Jiang, Luciana Vidas, Matthieu Chollet, Mariano Trigo, Simon Wall, James M. Glownia, Timothy A. Miller |
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| Rok vydání: | 2018 |
| Předmět: |
Diffraction
Phase transition Multidisciplinary Materials science Phonon Scattering Oscillation 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Reaction coordinate Photoexcitation Chemical physics 0103 physical sciences Femtosecond 010306 general physics 0210 nano-technology |
| Zdroj: | Science |
| ISSN: | 1095-9203 0036-8075 |
| Popis: | Snapshots of a phase transition Time-resolved x-ray scattering can be used to investigate the dynamics of materials during the switch from one structural phase to another. So far, methods provide an ensemble average and may miss crucial aspects of the detailed mechanisms at play. Wall et al. used a total-scattering technique to probe the dynamics of the ultrafast insulator-to-metal transition of vanadium dioxide (VO 2 ) (see the Perspective by Cavalleri). Femtosecond x-ray pulses provide access to the time- and momentum-resolved dynamics of the structural transition. Their results show that the photoinduced transition is of the order-disorder type, driven by an ultrafast change in the lattice potential that suddenly unlocks the vanadium atoms and yields large-amplitude uncorrelated motions, rather than occurring through a coherent displacive mechanism. Science , this issue p. 572 ; see also p. 525 |
| Databáze: | OpenAIRE |
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