Short small-polaron lifetime in the mixed-valence perovskite Cs${}_2$Au${}_2$I${}_6$ from high-pressure pump-probe experiments

M. Trigo, J. Chen, M. P. Jiang +5

We study the ultrafast phonon response of mixed-valence perovskite Cs${}_2$Au${}_2$I${}_6$ using pump-probe spectroscopy under high-pressure in a diamond anvil cell. We observed a remark…