Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 40: Ultrafast electron dynamics at surface and interfaces – Poster (joint session O/TT)

O 40.10: Poster

Tuesday, March 10, 2026, 14:00–16:00, P2

Ultrafast Electron Diffraction Study of Lattice Dynamics in Elemental Chromium — •Justus Richter^1,2, Victoria Taylor¹, Hyein Jung^1,2, Ralph Ernstofer^1,2, and Yoav William Windsor^1,2 — ¹Fritz-Haber-Institut der MPG, Berlin — ²Institut für Physik und Astronomie, Technische Universität Berlin

Femtosecond electron diffraction (FED) allows to quantitively study ultrafast atomic motion. Here we use FED to study photoinduced atomic motion in Cr. We saw that measurements taken above- and below T_N exhibit qualitatively different responses from the lattice, hinting to the effect of the spin-induced periodic lattice distortion within the antiferromagnetic Cr phase, though further investigation is required. A two temperature model (TTM) was used to model the energy flow between the electronic and lattice subsystems by which we extract an estimate for the electron-phonon coupling constant G_ep = (4.8±0.6) × 10¹⁷ Jm⁻³K⁻¹, which fits into the wide range of values reported in literature. Finally, we measured Cr side-by-side with Pt and demonstrate qualitative differences in their temporal responses, including a significantly faster thermalization of the Cr lattice and differences in the shape of their temporal response.

Keywords: Chromium; Platinum; Ultrafast electron-diffraction; Antiferromagnatic; Electron-Phonon-Coupling