The ultrafast dynamics of photoinduced phase transition (PIPT) in a crystal of Pr1-xCaxMnO3 (x 0.37) stud 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 witiiin ~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 photothermal 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+.
|Number of pages||4|
|Journal||Physica Status Solidi (C) Current Topics in Solid State Physics|
|Publication status||Published - Apr 6 2009|
|Event||8th International Conference on Excitonic Processes in Condensed Matter, EXCON'08 - Kyoto, Japan|
Duration: Jun 22 2008 → Jun 27 2008
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics