Nanoscale charge-order dynamics in stripe-phase nickelates probed via ultrafast THz spectroscopy

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We discuss equilibrium and ultrafast optical pump-THz probe spectroscopy of the model stripe-ordered system La 1.75 Sr 0.25 NiO 4 . We present a multi-oscillator analysis of the phonon bending mode splitting observed at low temperatures in equilibrium, along with a variational model for the transient THz reflectivity variations. The low temperature splitting is directly related to the formation of the long-range stripe-order, while the background conductivity is reminiscent of the opening of the mid-IR pseudogap. Ultrafast experiments in the multi-THz spectral range show strong THz reflectivity variations around the phonon bending mode frequency (≈11 THz).

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