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Related Experiment Videos

Projected wave functions and high temperature superconductivity.

A Paramekanti1, M Randeria, N Trivedi

  • 1Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai, 400005 India.

Physical Review Letters
|December 12, 2001
PubMed
Summary
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This study investigates the Hubbard model for cuprates, revealing a superconductor whose properties, including critical temperature and quasiparticle weight, align with experimental observations for doping levels up to 0.35.

Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Cuprate superconductors exhibit complex phase diagrams and unusual electronic properties.
  • Understanding the interplay between doping, electronic correlations, and superconductivity is crucial.

Purpose of the Study:

  • To investigate the Hubbard model with parameters relevant to cuprates.
  • To explain the nonmonotonic behavior of critical temperature (T(c)) and other observed phenomena.

Main Methods:

  • Variational Monte Carlo (VMC) simulations were employed.
  • Projected d-wave states were used to model the superconducting phase.
  • Analysis of spectral functions and their moments was performed.

Main Results:

  • A superconductor was obtained for doping 0

Related Experiment Videos

  • The variational parameter Delta(var)(x) correlates with the (pi,0) "hump" and T* observed in photoemission spectroscopy.
  • Nodal quasiparticle weight Z was found to be approximately x, while Fermi velocity remains finite as x approaches 0.
  • Drude weight D(low) and superfluid density align with experimental data, with D(low) approximately Z.

    • Conclusions:

    • The study provides a theoretical framework for understanding superconductivity in cuprates.
    • The results highlight the importance of projected d-wave states and electron correlations.
    • The findings offer insights into the relationship between doping, electronic structure, and superconducting properties.