  Revealing the predominant driving force behind symmetry breaking in
correlated materials is sometimes a formidable task due to the intertwined
nature of different degrees of freedom. This is the case for
La2-xSrxNiO4+{\delta} in which coupled incommensurate charge and spin stripes
form at low temperatures. Here, we use resonant X-ray photon correlation
spectroscopy to study the temporal stability and domain memory of the charge
and spin stripes in La2-xSrxNiO4+{\delta}. Although spin stripes are more
spatially correlated, charge stripes maintain a better temporal stability
against temperature change. More intriguingly, charge order shows robust domain
memory with thermal cycling up to 250 K, far above the ordering temperature.
These results demonstrate the pinning of charge stripes to the lattice and that
charge condensation is the predominant factor in the formation of stripe orders
in nickelates.
