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Strain-engineering Mott-insulating La2CuO4.

O Ivashko1, M Horio2, W Wan3

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Optimizing substrate conditions enhances superconductivity in cuprates. Compressive strain boosts Coulomb and magnetic-exchange interactions in lanthanum copper oxide (La2CuO4) thin films, leading to higher transition temperatures (Tc).

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Unconventional superconductivity's transition temperature (Tc) is tunable.
  • Optimal substrates vary for different materials, e.g., FeSe and La2-xSrxCuO4.
  • Understanding microscopic parameters for tuning Tc in thin films is crucial.

Purpose of the Study:

  • Investigate optimal conditions for superconductivity in thin films.
  • Identify microscopic parameters driving changes in Tc.
  • Determine methods for tuning Tc.

Main Methods:

  • X-ray absorption spectroscopy (XAS).
  • Resonant inelastic X-ray scattering (RIXS).
  • Theoretical calculations.

Main Results:

  • Compressive strain enhances Coulomb and magnetic-exchange interactions in La2CuO4 thin films.
  • Optimal substrates increase Tc by enhancing nearest-neighbor hopping, Coulomb, and magnetic-exchange interactions.
  • Strong correlation between substrate, parent Mott state, and Tc.

Conclusions:

  • Optimizing the parent Mott state is a viable strategy for enhancing superconducting transition temperatures in cuprates.
  • Substrate-induced strain is a key factor in tuning superconductivity.
  • The findings provide a pathway for designing high-Tc superconducting materials.