Ultrafast Light-Driven Electronic and Structural Changes in LaFeO₃ Perovskites Probed by Femtosecond X-Ray Absorption Spectroscopy.

ABSTRACT: Conducting real-time, element-specific studies of photo-excited systems is a long-standing challenge. The development of X-ray free-electron lasers (XFELs) has paved the way for the emergence of a promising technique: femtosecond X-ray absorption spectroscopy (fs-XAS). This powerful technique reveals electronic and geometric characteristics, providing unprecedented insight into their dynamic interactions under nonequilibrium conditions. Herein, the fs-XAS technique is employed at PAL-XFEL to unravel light-driven ultrafast electronic and structural changes in epitaxial lanthanum iron oxide (LaFeO₃) thin films. Density functional theory (DFT) and multiplet calculations are utilized to expound on the experimental results. The analyses reveal that photoexcitation initially induces h

SUBMITTER: Lazemi M 

PROVIDER: S-EPMC12288815 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature