Ultrafast charge localization in a stripe-phase nickelate

G. Coslovich (), B. Huber, W. -S. Lee, Y. -D. Chuang, Y. Zhu, T. Sasagawa, Z. Hussain, H. A. Bechtel, M. C. Martin, Z. -X. Shen, R. W. Schoenlein and R. A. Kaindl ()
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G. Coslovich: E. O. Lawrence Berkeley National Laboratory
B. Huber: E. O. Lawrence Berkeley National Laboratory
W. -S. Lee: SIMES, SLAC National Accelerator Laboratory, Stanford University
Y. -D. Chuang: Advanced Light Source, E. O. Lawrence Berkeley National Laboratory
Y. Zhu: E. O. Lawrence Berkeley National Laboratory
T. Sasagawa: Materials and Structures Laboratory, Tokyo Institute of Technology
Z. Hussain: Advanced Light Source, E. O. Lawrence Berkeley National Laboratory
H. A. Bechtel: Advanced Light Source, E. O. Lawrence Berkeley National Laboratory
M. C. Martin: Advanced Light Source, E. O. Lawrence Berkeley National Laboratory
Z. -X. Shen: SIMES, SLAC National Accelerator Laboratory, Stanford University
R. W. Schoenlein: E. O. Lawrence Berkeley National Laboratory
R. A. Kaindl: E. O. Lawrence Berkeley National Laboratory

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract Self-organized electronically ordered phases are a recurring feature in correlated materials, resulting in, for example, fluctuating charge stripes whose role in high-TC superconductivity is under debate. However, the relevant cause–effect relations between real-space charge correlations and low-energy excitations remain hidden in time-averaged studies. Here we reveal ultrafast charge localization and lattice vibrational coupling as dynamic precursors of stripe formation in the model compound La1.75Sr0.25NiO4, using ultrafast and equilibrium mid-infrared spectroscopy. The opening of a pseudogap at a crossover temperature T* far above long-range stripe formation establishes the onset of electronic localization, which is accompanied by an enhanced Fano asymmetry of Ni-O stretch vibrations. Ultrafast excitation triggers a sub-picosecond dynamics exposing the synchronous modulation of electron–phonon coupling and charge localization. These results illuminate the role of localization in forming the pseudogap in nickelates, opening a path to understanding this mysterious phase in a broad class of complex oxides.

Date: 2013
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DOI: 10.1038/ncomms3643

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