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Related Experiment Videos

Phonon screening in high-temperature superconductors

Homes1, McConnell, Clayman

  • 1Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.

Physical Review Letters
|September 16, 2000
PubMed
Summary

Optical phonons are typically screened in conductors but observed in cuprates like Pr1.85Ce0.15CuO4. Poor screening in these copper-oxygen materials may stem from charge inhomogeneities.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid-state chemistry

Background:

  • Optical phonons are usually screened and unobservable in good conductors.
  • Cuprates, such as Pr1.85Ce0.15CuO4 and YBa2Cu3O6.95, exhibit unusual optical conductivity features.
  • Comparison is made with eta-Mo4O11, where lattice modes emerge below a charge-density wave transition.

Purpose of the Study:

  • To investigate the observation of optical phonons in specific cuprate materials.
  • To understand the poor or absent screening of infrared-active modes in the copper-oxygen planes of cuprates.
  • To explore the origin of poor screening by comparing cuprates with eta-Mo4O11.

Main Methods:

  • Analysis of optical conductivity spectra.
  • Measurement of oscillator strengths for infrared-active modes.

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  • Comparative study with materials exhibiting charge-density wave transitions.

    • Main Results:

    • Sharp features attributed to infrared-active modes were observed in the optical conductivity of Pr1.85Ce0.15CuO4 and YBa2Cu3O6.95.
    • Oscillator strength analysis revealed poor or absent screening of these modes in the cuprates.
    • Lattice modes were observed to appear suddenly below the charge-density wave transition in eta-Mo4O11.

    Conclusions:

    • The observed optical phonon modes in cuprates suggest a deviation from typical screening behavior in good conductors.
    • Poor screening in cuprates is proposed to originate from fluctuating charge inhomogeneities within the copper-oxygen planes.
    • The findings provide insights into the electronic properties and lattice dynamics of high-temperature superconductors.