Detection of a Jahn–Teller mode as an ultrafast fingerprint of spin-transition-induced charge transfer in CoFe Prussian Blue Analogue

Abstract

Using sub-20-fs ultrafast spectroscopy, we unravel high-frequency vibrational coherences during the photoinduced charge transfer in the CoFe Prussian Blue Analogue, attributed to the transient activation of a low-symmetry Jahn–Teller mode.