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Related Experiment Videos

Increasing d-wave superconductivity by on-site repulsion.

E Plekhanov1, S Sorella, M Fabrizio

  • 1Istituto Nazionale di Fisica della Materia, Via Beirut 2-4, I-34014 Trieste, Italy.

Physical Review Letters
|June 6, 2003
PubMed
Summary
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This study shows that on-site repulsion (U) can enhance superexchange (J) interactions, promoting d-wave superconductivity by suppressing opposing repulsion (V). This highlights how certain attractions benefit from strong electron-electron repulsion.

Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • Extended Hubbard models describe correlated electron systems.
  • Superconductivity is influenced by competing interactions like superexchange (J) and repulsion (V).

Purpose of the Study:

  • Investigate the role of on-site repulsion (U) in an extended Hubbard model.
  • Determine how U affects competing nearest-neighbor interactions (J and V).
  • Analyze the impact on d-wave superconductivity.

Main Methods:

  • Variational Monte Carlo technique.
  • Study of an extended Hubbard model with competing interactions.

Main Results:

  • On-site repulsion (U) enhances superexchange (J), favoring superconductivity.

Related Experiment Videos

  • On-site repulsion (U) suppresses repulsive interaction (V).
  • Attractions not involving charge fluctuations benefit from strong electron-electron repulsion.

    • Conclusions:

    • On-site repulsion (U) can be beneficial for achieving d-wave superconductivity.
    • Understanding electron-electron repulsion is key to designing novel superconductors.
    • This work provides insights into the mechanisms of unconventional superconductivity.