Abstract
Recent developments in the study of ultrafast dynamics are reviewed concerning the spin ladder system, α'-NaV2O5, which is known to have a charge order phase transition accompanying spin dimerization at 34 K. The low energy excitations specific to the low temperature phase is observed by coherent excitation method and their origins are discussed, comparing with the Raman and infrared absorption data. Photoinduced phenomena are studied by transient reflectance and time-resolved Raman spectroscopy and the thermal and nonthermal effects are distinguished by their response time.
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