Direct imaging of ultrafast lattice dynamics.

Abstract:

:Under rapid high-temperature, high-pressure loading, lattices exhibit complex elastic-inelastic responses. The dynamics of these responses are challenging to measure experimentally because of high sample density and extremely small relevant spatial and temporal scales. Here, we use an x-ray free-electron laser providing simultaneous in situ direct imaging and x-ray diffraction to spatially resolve lattice dynamics of silicon under high-strain rate conditions. We present the first imaging of a new intermediate elastic feature modulating compression along the axis of applied stress, and we identify the structure, compression, and density behind each observed wave. The ultrafast probe x-rays enabled time-resolved characterization of the intermediate elastic feature, which is leveraged to constrain kinetic inhibition of the phase transformation between 2 and 4 ns. These results not only address long-standing questions about the response of silicon under extreme environments but also demonstrate the potential for ultrafast direct measurements to illuminate new lattice dynamics.

journal_name

Sci Adv

journal_title

Science advances

authors

Brown SB,Gleason AE,Galtier E,Higginbotham A,Arnold B,Fry A,Granados E,Hashim A,Schroer CG,Schropp A,Seiboth F,Tavella F,Xing Z,Mao W,Lee HJ,Nagler B

doi

10.1126/sciadv.aau8044

subject

Has Abstract

pub_date

2019-03-08 00:00:00

pages

eaau8044

issue

3

issn

2375-2548

pii

aau8044

journal_volume

5

pub_type

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