Ultrafast Mid-infrared Spectroscopy of the Charge- and Spin-Ordered Nickelate La1.75Sr0.25NiO4
1 Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
2 SIMES, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA
3 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
4 Materials and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan
a e-mail: GCoslovich@lbl.gov
We present the first ultrafast mid-infrared study of charge and spin-ordered nickelates. A sub-picosecond modulation of the optical reflectivity is observed, indicating the filling and subsequent re-establishment of the pseudogap in the time-domain.
© Owned by the authors, published by EDP Sciences, 2013
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