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Transient reflectance changes are studied for a spin ladder system α′-NaV 2 O 5 in the temperature range from 4K to room temperature (RT), by means of femtosecond pump-and-probe measurements. A large response with a slow rise (3ps) and a slow decay (>400ps) is found only below 34K, the phase transition temperature of charge ordering. Analyzing the temperature dependence of the amplitude...
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