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

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

2011-11-22

arxiv.org/abs/1111.5260v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

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 remarkable softening and broadening of the Au - I stretching phonon mode with both applied pressure and photoexcitation. Using a double-pump scheme we measured a lifetime of the charge transfer excitation into single valence Au$^{2+}$ of less than 4 ps, which is an indication of the local character of the Au$^{2+}$ excitation. Furthermore, the strong similarity between the pressure and fluence dependence of the phonon softening shows that the inter-valence charge transfer plays an important role in the structural transition.

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