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Abstract
Time resolved optical reflectivity and x-ray diffraction techniques are employed to study the laser-induced structural response in two charge and orbitally ordered manganites. Optical data indicate a non-thermal nature of the laser-triggered phase transition via the disappearance of an optical phonon related to the charge and orbitally ordered phase. The x-ray diffraction measurements on superlattice reflections confirm the non-thermal time scale of the initial step of this phase transition but also show that the complete change of structural symmetry is not instantaneous.
Highlights
Transition metal oxides with a perovskite structure feature multifaceted phase diagrams due to their close interaction of charge, atomic order and spin
Recent results on a CO/OO thin film of La0.42Ca0.58MnO3 using femtosecond xray diffraction to probe directly the structural dynamics show that photo-excitation can induce an ultrafast non-thermal phase transition measured via the disappearance of a superlattice reflection [4]
The temperature dependences reproduce well the main findings of previously reported data recorded with high repetition rate lasers [10, 11]: A displacively excited coherent phonon with a period of ~2.0 THz in LCMO and ~2.5 THz in LPCMO, only present in the charge and orbitally ordered phase for T ≤ TCO ≈ 210 K
Summary
Transition metal oxides with a perovskite structure feature multifaceted phase diagrams due to their close interaction of charge, atomic order and spin. Time resolved optical reflectivity and x-ray diffraction techniques are employed to study the laser-induced structural response in two charge and orbitally ordered manganites. Optical data indicate a non-thermal nature of the laser-triggered phase transition via the disappearance of an optical phonon related to the charge and orbitally ordered phase.
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