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14 March 2013 Ultrafast mid-infrared spectroscopy of the charge- and spin-ordered nickelates
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We discuss the mid-infrared optical response of a charge and spin-ordered nickelate in the ultrafast time domain. A strong photo-induced modulation of the optical reflectivity is observed on the sub-picosecond timescale, indicating the transient filling and recovery of the pseudogap in the mid-infrared charge transport. A variational Kramers-Kronig analysis of equilibrium reflectivity data is extended to time-resolved experiments, allowing us to extract the optical conductivity despite a comparatively limited frequency range of tunable femtosecond parametric sources. The fast dynamics of the spectral weight transfer supports an electronic origin of the mid-infrared pseudogap in nickelates.
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G. Coslovich, B. Huber, W.-S. Lee, Y.-D. Chuang, Y. Zhu, T. Sasagawa, Z. Hussain, H. A. Bechtel, M. C. Martin, R. W. Schoenlein, Z.-X. Shen, and R. A. Kaindl "Ultrafast mid-infrared spectroscopy of the charge- and spin-ordered nickelates", Proc. SPIE 8623, Ultrafast Phenomena and Nanophotonics XVII, 862308 (14 March 2013);

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