Static and Ultrafast Time Resolved X-ray Spectroscopy Study on Strongly Correlated System
Manganites have attracted a great research interests since the discovery of Colossal Magneto-resistance. Pr1-xCaxMnO3 is among the most studied family member of manganites, not only due to its highest magneto resistance ratio, but also because of the photon and phonon induced insulator to metal phase transition recently found in it.
With the development of the ultrafast time resolved synchrotron beamline and X-ray free electron laser facility, ultrafast X-ray technique is becoming an important experimental tool to study the ultrafast phenomenon in strongly correlated system. In this talk, I will present a series of static and ultarfast time resolved X-ray spectroscopy studies to address the physics of the photon induced phase transition in Pr1-xCaxMnO3. We found that the photon induced d-d transition and the subsequent spin ordering melting process is the key to this ultrafast phase transition.