Journal
PHYSICAL REVIEW B
Volume 85, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.081102
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Funding
- US Department of Energy office of Basic Energy Science through the Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- AFOSR [FA9550-09-1-0583]
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We study the ultrafast phonon response of mixed-valence perovskite Cs2Au2I6 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 Au2+ of less than 4 ps, which is an indication of the local character of the Au2+ excitation. Furthermore, the strong similarity between the pressure and fluence dependence of the phonon softening shows that the intervalence charge transfer plays an important role in the structural transition.
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