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Dynamic charge inhomogeneity in cuprate superconductors
1Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Strasse 10, 48149 Münster, Germany.
Summary
Anomalous phonon behavior in cuprates suggests charge stripes. These inhomogeneities may reconstruct the Fermi surface, impacting superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Chemistry
Background:
- Cuprates are key materials in superconductivity research.
- Understanding phonon behavior is crucial for elucidating their electronic properties.
Purpose of the Study:
- To analyze phonon dispersion in HgBa(2)CuO(4) and Bi(2)Sr(2)CuO(6) using inelastic X-ray scattering.
- To investigate discrepancies between experimental phonon data and theoretical calculations.
Main Methods:
- Lorentz fitting of inelastic X-ray scattering spectra.
- Analysis of Δ(1) symmetry phonons, focusing on CuO bond-stretching modes.
- Comparison with recently calculated phonon frequencies.
Main Results:
- Experimental phonon frequencies largely agree with calculations.
- A significant disagreement was found for the second-highest Δ(1) branch, indicating anomalous softening.
- This anomalous softening suggests static charge inhomogeneities, likely charge stripes along CuO bonds.
Conclusions:
- The observed phonon anomalies point to static and dynamic charge inhomogeneities in the CuO planes.
- These inhomogeneities break symmetry and can lead to Fermi surface reconstruction into small pockets.
- This finding offers new insights into the complex electronic behavior of cuprates.
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