Abstract
AbstractThe ultrafast dynamics of photoinduced phase transition (PIPT) in a crystal of Pr1–x Cax MnO3 (x = 0.37) has been studied by means of femtosecond time‐resolved spectroscopy. Just after photoirradiation of 1.58 eV light at 100 K, ultrafast change of reflectivity (ΔR/R) was observed within ∼1 ps utilizing the probe light of 0.5 eV due to the ferromagnetic metallic phase transition. While the fast component of ΔR/R gradually increases with increasing the excitation intensity, the slow component observed at the delay time of ∼1 ps shows unusual dependence on the excitation intensity. The signature of ΔR/R changes from negative to positive with the excitaiton power, which cannot be explained by the photo‐thermal heating effect. In addition, we investigated the temperature dependence of the ΔR/R at 0.5 eV and observed the sudden change of ΔR/R around TN, which indicates that the efficiency of PIPT is closely correlated with the ordering of spin and extra electron in Mn4+. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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