  The transition between different states in manganites can be driven by
various external stimuli. Controlling these transitions with light opens the
possibility to investigate the microscopic path through which they evolve. We
performed femtosecond (fs) transmission electron microscopy on a bi-layered
manganite to study its response to ultrafast photoexcitation. We show that a
photoinduced temperature jump launches a pressure wave that provokes coherent
oscillations of the lattice parameters, detected via ultrafast electron
diffraction. Their impact on the electronic structure are monitored via
ultrafast electron energy loss spectroscopy (EELS), revealing the dynamics of
the different orbitals in response to specific structural distortions.
