14 March 2015 Nanoscale charge-order dynamics in stripe-phase nickelates probed via ultrafast THz spectroscopy
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Abstract
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, Sascha Behl, B. Huber, H. A. Bechtel, T. Sasagawa, M. C. Martin, 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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