14 March 2015 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 La1.75Sr0.25NiO4. 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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G. Coslovich, G. Coslovich, Sascha Behl, Sascha Behl, B. Huber, B. Huber, H. A. Bechtel, H. A. Bechtel, T. Sasagawa, T. Sasagawa, M. C. Martin, M. C. Martin, R. A. Kaindl, R. A. Kaindl, "Nanoscale charge-order dynamics in stripe-phase nickelates probed via ultrafast THz spectroscopy", Proc. SPIE 9361, Ultrafast Phenomena and Nanophotonics XIX, 93611D (14 March 2015); doi: 10.1117/12.2080724; https://doi.org/10.1117/12.2080724

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