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Related Experiment Videos

Stripe conductivity in La1.775Sr0.225NiO4

Pashkevich1, Blinkin, Gnezdilov

  • 1A. A. Galkin Donetsk Phystech NASU, 83114 Donetsk, Ukraine.

Physical Review Letters
|October 6, 2000
PubMed
Summary

Raman spectroscopy and optical conductivity reveal charge-stripe order in La1.775Sr0.225NiO4. This stripe order influences phonon energies and indicates finite conductivity within the charge stripes.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • La1.775Sr0.225NiO4 exhibits incommensurate charge-stripe order.
  • Understanding the electronic and vibrational properties associated with charge-stripe order is crucial.

Purpose of the Study:

  • To investigate the relationship between charge-stripe order and phonon behavior.
  • To determine the dynamical conductivity within the charge stripes.

Main Methods:

  • Raman light-scattering measurements on a single crystal of La1.775Sr0.225NiO4.
  • Optical conductivity measurements.

Main Results:

  • Observed extra phonon peaks correlated with the charge-order wave vector Q(c).

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  • Identified a strong Fano antiresonance in a Ni-O bond-stretching mode.
  • Provided evidence for finite dynamical conductivity confined within the charge stripes.

    • Conclusions:

    • Phonon anomalies are directly linked to the incommensurate charge-stripe order.
    • The Fano resonance confirms the presence of mobile charge carriers within the stripes, impacting conductivity.