Using Diffuse Scattering to Observe X-Ray-Driven Nonthermal Melting
In this work, we present results from the SPring-8 Angstrom Compact free electron LAser facility, where we used a high intensity (~1020 W/cm2) x-ray pump x-ray probe scheme to observe changes in the ionic structure of silicon induced by x-ray heating of the electrons. By avoiding Laue spots in the scattering signal from a single crystalline sample, we observe a rapid rise in diffuse scattering and a transition to a disordered, liquidlike state with a structure significantly different from liquid silicon. The disordering occurs within 100 fs of irradiation, a timescale that agrees well with first principles simulations, and is faster than that predicted by purely inertial behavior, suggesting that both the phase change and disordered state reached are dominated by Coulomb forces. This method is capable of observing liquid scattering without masking signal from the ambient solid, allowing the liquid structure to be measured throughout and beyond the phase change.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Japan Society for the Promotion of Science (JSPS); Japan Synchrotron Radiation Research Institute (JASRI); Australian Research Council
- Grant/Contract Number:
- 16K17846; VH-NG-1141; DP170100131; AC02-76SF00515; 2017B8075; 2018A8056
- OSTI ID:
- 1755990
- Alternate ID(s):
- OSTI ID: 1768246
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Vol. 126 Journal Issue: 1; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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