Tuning Superconductivity and Charge Correlations in Kagome Metal CsV3Sb5

Strategic Insights -

Research conducted by a team of scientists at the University of California Santa Barbara has revealed new insights into the interplay between superconductivity and charge correlations in the kagome metal CsV3Sb5. The study found that external perturbations, such as doping or pressure, can tune the behavior of this material, which exhibits unconventional superconductivity. By substituting titanium into the vanadium sites in CsV3-xTixSb5, the researchers observed changes in the nature of charge correlations as a function of hole doping, shedding light on the complex relationships between charge and superconductivity in this system.

Key Takeaways:

  • The interplay between superconductivity and charge correlations in CsV3Sb5 can be tuned by external perturbations such as doping or pressure.
  • Hole doping via titanium substitution on the V kagome sites in CsV3-xTixSb5 leads to changes in the nature of charge correlations as a function of hole doping.
  • The superconducting phase remains conventional and unchanged across the phase diagram, while the nature of charge correlations evolves with hole doping.
  • Competing 2 x 2 x 2 and 2 x 2 x 4 supercells form within the charge density wave state for Ti doping in the first superconducting dome and are suppressed rapidly with carrier substitution.
  • No charge correlations are detected in the second superconducting dome.
  • The disorder potential associated with hole doping via chemical substitution on the V and Sb sites is shown to be different, particularly in the second superconducting dome.
  • The research has been peer-reviewed and published in Physical Review Materials.

Statistics:

  • 2 x 2 x 2 and 2 x 2 x 4 supercells are formed within the charge density wave state for Ti doping in the first superconducting dome.
  • Charge correlations are suppressed with carrier substitution in the first superconducting dome.
  • No charge correlations are detected in the second superconducting dome.
  • The research received funding from the United States Department of Energy (DOE), National Science Foundation (NSF), NSF Materials Research Science and Engineering Center at UC Santa Barbara, and University of West Georgia.

Sources:

  • NewsRx. Data on Physics Detailed by Researchers at University of California Santa Barbara (Evolution of Charge Correlations In the Hole-doped Kagome Superconductor Csv3-xtixsb5). Journal of Physics Research. October 21, 2025; p 45.
  • Physical Review Materials, 2025;9(9).