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SUMMARY:Structural and electronic properties of 3D metals up to Warm Dense
  Matter conditions
DTSTART:20260519T123000Z
DTEND:20260519T133000Z
DTSTAMP:20260526T023300Z
UID:indico-event-25067@indico.gsi.de
CONTACT:p.neumayer@gsi.de\;c.deguchi@gsi.de
DESCRIPTION:Speakers: Sofia Balugani (EPFL - École polytechnique fédéra
 le de Lausanne)\n\nThis seminar presents the results of my PhD thesis inve
 stigating iron (Fe) and copper (Cu) under extreme pressure and temperature
 . Conducted in collaboration with First Light Fusion (FLF)\, the study aim
 s to constrain the Equations of State (EOS) for the metallic components us
 ed in their nuclear fusion technology. Beyond fusion\, these results are c
 ritical for geophysics to model planetary interiors.\nUsing the High-Power
  Laser Facility at the ESRF\, we subjected these metals to laser-driven sh
 ock waves\, reaching the Warm Dense Matter (WDM) regime with conditions up
  to 300 GPa and 7000 K. The microscopic structural and electronic changes 
 were probed with ultra-fast (100 ps) X-ray Absorption Spectroscopy. A sign
 ificant part of this work focused on overcoming the difficulty of measurin
 g temperature under shock. We used a promising method by extracting temper
 atures directly from EXAFS oscillations\, supported by DFT-MD simulations 
 and FEFF modelling to identify crystalline phases.\nThe results provide ne
 w constraints on the melting curves of both metals\, as well as on the str
 uctural phase of iron in the vicinity of its melting curve at pressures re
 levant for the Earth’s core and the fcc-to-bcc phase transition in coppe
 r at multi-megabar pressures. Finally\, we observed a contrasting evolutio
 n in the electronic structure of these two metals- a redshift in the absor
 ption edge for iron and a blueshift for copper. While current theories pre
 dict these trends\, they consistently overestimate the effect\, highlighti
 ng the need for further study of 3d transition metals under dynamic compre
 ssion.\n\nhttps://indico.gsi.de/event/25067/
LOCATION:SB3 3.170a (GSI)
URL:https://indico.gsi.de/event/25067/
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