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Ultrafast charge localization in a stripe-phase nickelate

Author

Listed:
  • 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)

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.

Suggested Citation

  • 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 & R. A. Kaindl, 2013. "Ultrafast charge localization in a stripe-phase nickelate," Nature Communications, Nature, vol. 4(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3643
    DOI: 10.1038/ncomms3643
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